B SERIES ELECTRIC FURNACE

Transcription

1 ISALLAIO AD US AUAL B SIS LI FUA AD I AADA FABIQUÉ AU AADA FB000 ODLS: 1B10, 1B15, 1B18, 1B0, 1B5, 1B7S, 83B13, 83B AD 83B7 IPOA: AD AD SAV HS ISUIOS. OO; Sherbrooke, Quebec

2 ever tamper with the unit or its controls. User US contact a specialized contractor when a failure occurs. DO O AP to repair. hen using a humidifier make sure not to damage the heating element bank. e recommend that your unit be inspected by a specialized technician once a year. Poor maintenance of air filters O an unbalanced static pressure may result in a performance decrease. Always use genuine parts for maintenance or service call. he use of unbranded parts will void the warranty. he use of this unit without an air distribution duct will void the warranty. It is strictly forbidden to use jumpers to simulate heat demand. isk of electrical shock. Disconnect power before installation, servicing, maintenance or field wiring. eplace all panels before operating. Failure to do so can result in electrical shock causing severe injuries or death. hen performing installation, servicing or cleaning the unit, it is recommended to wear safety glasses and gloves. o assure a proper performance of your furnace, we recommend that you use high quality name brand thermostats. hen applicable local regulation comprises more restrictive installation and/or certification requirements, the aforementioned requirements prevail on those of this document and the installer agrees to conform to these at his own expense. For your safety, do not store or use gasoline or other flammable liquids and vapors in the vicinity of this unit or any other appliance. hese instructions are intended to be used by qualified personnel who have been trained in installing this type of furnace. Installation of this furnace by an unqualified person may lead to equipment damage and/or hazardous condition which may lead to bodily harm. his furnace is not watertight and is not designed for outdoor installation. his furnace shall be installed in such a manner as to protect its electrical components from water. Outdoor installation leads to a hazardous electrical condition and to premature furnace failure, thus voiding the warranty. Do not block the combustion air openings in the furnace. Any blockage will result in improper overheat situation and may result in a fire hazard and/or cause bodily harm. he unit must have an uninterrupted or unbroken electrical ground to minimize personal injury if an electrical fault should occur. hen performing electrical connection, the ground conductor must be firmly attached to the ground lug in the furnace. Do not use this furnace as a construction heater. Use of this furnace as a construction heater exposes the furnace to abnormal conditions, contaminated combustion air and the lack of air filters. Failure to follow this warning can lead to premature furnace failure and/or vent failure which could result in a fire hazard and/or bodily harm. he owner and/or the user is responsible of the following: Always maintain the immediate surrounding of the furnace free from combustible and highly flammables materials.he furnace ambient air should not have an excessive dust concentration and humidity. ever operate this central heating appliance without an air filter. Before performing any service functions, unless operations specifically require the power to be on, make sure all utilities are turned OFF upstream of the appliance. Failure to comply with this warning will cause a fire hazard and/or bodily harm. All questions regarding the operation, maintenance or warranty of this unit should be addressed to the company where this product has been sold from. AUIO ever burn garbage or paper in the heating system and never leave rags or paper around the unit. eturn air grilles and warm air registers must not be obstructed. IPOA: All local and national code requirements governing the electrical installation heating equipment, wiring and flue connections must be followed. Some of the codes that may be applicable are : ASI/FPA 70 AIOAL LIAL OD SA.1 AADIA LIAL OD Only the latest issues of the above codes should be used, and are available from either: he ational Fire Protection Agency or he anadian Standards Association Batterymarch Park 178 exdale Blvd. Quincy, A 069 exdale, Ontario

3 A OF OS 1. DISIOS AL QUIS AD SPIFIAIOS OPAI OPIOS BAKS ISALLAIO OS OLD AI U LIAL II - PO SUPPL OI AD ADJUSI H LO VOLA HOSA US I OBIL HOS USI OPIOAL QUIP O-SA O OUDOO HOSA AI ODIIOI LOI AI LAS AD/O POD FUA HUIDIFIS ILOK OIO II DIAAS SVI PAS AIA OUSHOOI AA DISIOS 0 (508 mm) OP VI 1½ (38 mm) 17 x 17 (3 mm x 3 mm) DISHA 1½ (38 mm) II KO S VALUS A = 1³/8 (35 mm) B = 1¼ (3 mm) & 1¾ ( mm) = 7/8 ( mm) & (51 mm) 39 (991 mm) FO VI IH SID VI A VI LF SID VI 0 (508 mm) 1 (5 mm) FIL FA (IH SID, A O BOO) II KO S A B 18 x 18 (57 mm x 57 mm) 18 x 18 (57 mm x 57 mm) II KO S 18 x 18 (57 mm x 57 mm) 1½ x 1½ KO (38 mm x 38 mm) U 1½ x 1½ KO (38 mm x 38 mm) U 1½ x 1½ KO (38 mm x 38 mm) U FK000A - 3 -

4 . AL QUIS AD SPIFIAIOS AUIO his unit must be installed in a dry place, in a non-corrosive, well-ventilated environment, without excessive dust. he ambient temperatue must be over 10 and under 7. If the ambient temperatue is 10 or less, the plenum must be insulated on 10 ft linear minimum length. 1. LOAIO - he furnace should be centrally located to the heating area.. POSIIOS - It can be installed for vertical, horizontal or downflow operation. hen installed horizontally, the furnace should be positioned such as the door will not end up being on the top. he door should be on the side of the furnace, to ensure that the motor bearings are in their designed position. In vertical downflow installations, use only L - or -shaped plenum with no openings or registers directly below furnace. 3. ISALLAIO LAAS - As shipped from the factory, each unit is approved for zero inch clearance. If additional clearance is required, it will be indicated on the data label attached to the furnace.. PAU IS - Furnaces are shipped to operate at (50 Pa) external static pressure. hey are certified for operation up to (15 Pa). heck below for temperature rise table on specification chart and, if necessary, adjust the unit to match. 5. SVI LAA - Units are serviced from the FO. Leave at least (610 mm) clearance in front of the door. 0 VOLS - SIL PHAS PAU ODL O. K BHU APS IL. OO HP O F *SPD P 1B /3 3 1 LO 663 1B /3 3 D-LO x 8 1B18** /3 7 9 D-LO 81 (5 mm x 03 mm) 1B0** / D-LO 81 1B5** / D-LO 81 1 x 8 1B7S*** / D-HIH 707 (30 mm x 03 mm) 08 VOLS - H-PHAS 83B / D x 8 83B / D 960 (5 mm x 03 mm) 83B / D 960 SPD LO D-LO D-HIH HIH 10 x 8 (5 mm x 03 mm) O FLO A F F F F SAI PSSU (IHS OF A OLU) SPD LO**** D-LO**** D-HIH HIH 1 x 8 (30 mm x 03 mm) O FLO A F F F F SAI PSSU (IHS OF A OLU) AI: *FAO SIS. ** 1B18, 1B0 and 1B5 must O be setup to run continuously at LO speed as it will cause overheating conditions. hese models are certified to run only at HIH, D-HIH and D-LO speeds. *** 1B7S must O be setup to run continuously at LO or D-LO speeds, as it will cause overheating conditions. his model is certified to run only at HIH and D-HIH speeds. ****hese speeds can only be run with heater off, for cooling/ventilation purposes only. 1B7S has built-in additional noise-absorption components to run quietly during continuous or regular cycle modes. SPIFIAIOS SUBJ O HA IHOU OI - -

5 3. OPAI OPIOS he furnace is shipped from the factory in a Standard Heating ode (all switches are in the Down position). hen the thermostat calls for heat, the automatic controls will be activated and the furnace turned O. he blower will run at low speed as the furnace heats up and will automatically switch to the pre-programmed heating speed when additional elements are activated by the time delay relays. he timing of this blower speed change will depend on the size of the furnace (10 k and 13.5 k models do not change speed), and whether OLD or ILD is selected on the SASO SL switch. ou may, however, change from the Standard Heating ode by using the controls built into your furnace. IULAIO OD O OFF SASO SL ILD (O ILUDD I ODLS 1B10 AD 83B13) OLD O Some homeowners prefer the blower to run at low speed to more evenly distribute air in the house. In this position, the blower will run continuously on low and automatically change to the necessary heating speed when heating elements are turned on by the thermostat. OFF he blower motor will operate in the standard heating mode, controlled by the thermostat. ILD During spring and fall, you may not require full heating capacity to maintain a comfortable temperature. In this position, approximately half of the elements are off-line and will not be energized when the thermostat calls for heat. OLD All elements are on-line and controlled by the thermostat. O: If outdoor or two-stage thermostat is used, switch US be in ILD position at all times.. BAKS B Series furnaces are equipped with breakers, located on the front panel of the unit. hese devices protect the heating elements from overcurrent. If this situation occurs, the breakers will open to cut the power from the heating elements only. O: he number of breakers varies according to the furnace model; 1B10 model has no breakers, 1B15, 1B18, 1B0 and 83B13 models have breakers and 1B5, 1B7S, 83B and 83B7 models have 3 breakers. efer to Section 8 iring Diagrams. BAKS FD0003 Breakers do not cut power to entire furnace, only to the heating elements. Do not use the breakers to turn off the furnace. he power to the whole unit can only be cut from the main electrical panel

6 5. ISALLAIO OS 5.1 OLD AI U he duct can be attached to either side, rear or the bottom of the furnace. For side return there are four 1½ (38 mm) knockouts which can be removed and used as an outline for cutting a 18 x 18 (57 mm x 57 mm) return air opening in the furnace left or right side. ount the filter frame to the furnace over the opening with the open side of the frame facing front. hen attach the 19 x 19 (83 mm x 83 mm) air duct to the flanges on the filter frame. For bottom mounting, remove the screws holding the bottom plate to the furnace, discard the bottom plate and attach the filter frame to the bottom flanges with the open side of the frame facing front. 5. LIAL II - PO SUPPL he furnaces are completely factory wired. From a separate breaker, a two-wire plus ground supply wire is required for single phase units, and a three-wire plus ground supply wire for three phase units. he ground conductor must be firmly attached to the ground lug in the furnace and the supply wires to the terminal block in the furnace. O: On single-phase furnaces, when a FK10 kit is used to supply an air cleaner and/or humidifier, a third (neutral) conductor must be brought into the furnace. For all installations, we only recommend appropriate gauge good quality copper wire(s). However, it is the electrician s responsibility to ensure that the wiring and connections are compliant to the latest editions of the anadian lectrical ode and local codes. 5.3 OI AD ADJUSI H LO VOLA HOSA (Use only class 1 wires inside furnace compartments.) Attach thermostat wires to the low voltage terminal block located on the inside of the furnace. Follow the diagrams supplied with the thermostat. As a general guide, remember that the & terminals control single stage heating; the & terminals control cooling. Single stage cooling uses / as first and only stage.wo-stage cooling uses 1 as first stage and / as second stage. ake sure the thermostat is levelled on the wall and in appropriate location as per instructions supplied with the thermostat. AUIO Before turning the furnace on, the heat anticipator in the thermostat must be properly set. Because each installation is different an accurate reading of the current draw should be made with an A meter. Set the meter at A range for furnaces through 0 k, and at A range for larger units. A. Set the anticipator at its highest setting. B. Disconnect the 1 thermostat wire from the furnace low voltage terminal connections.. onnect the A meter between the 1 terminal on the board and the loose 1 wire. D. urn the thermostat up to start the furnace and allow it to run,with all elements on, for three or four minutes.. ead the current draw on the meter and reset the anticipator to match the meter reading. 6. US I OBIL HOS odels 1B10, 1B15, 1B18 & 1B0 are certified for L -shape and -shape shallow duct installation with model FSB-1 sub-base in downflow applications when the supply air ducts pass through the floor of the structure. ecommended size of a floor opening: 1¼ x 1¼ (36 mm x 36 mm). he duct system must be designed so that the external static pressure of the system does not exceed the maximum external static pressure of (15 Pa). SHALLO DU AA QUIS DU DPH DU IDH (10 mm) 16 (06 mm) 5 (17 mm) 13 (330 mm) 6 (15 mm) 10 (5 mm) - 6 -

7 7. USI OPIOAL QUIP 7.1 O-SA O OUDOO HOSA (he SASO SL switch must be in the ILD position). hese controls can be used on all furnaces except 10 k model. Follow the directions supplied with the two-stage or outdoor thermostat in conjunction with the furnace wiring diagram. hen used, the furnace stage will supply heat as follows in the opposite chart: odel First Stage (k) Second Stage (k) 10 k k k k k k AI ODIIOI our furnace is equipped with all the controls required for the addition of air conditioning (except the heat-cool thermostat). he evaporator coil may be installed by a local contractor in sheet metal plenum of his own manufacture. he coil should be located: centred over the chimney of the furnace (10 mm) to 6 (15 mm) above the top of the furnace. ake sure no air is allowed to bypass the cooling coil during cooling operation. If the discharge opening is a great deal larger than the coil, and the ductwork is correspondingly larger than the coil, you may want to use a bypass damper for heating. he damper would be closed in summer, directing all air flow through the coil. In winter the damper would be open to allow air to bypass the coil. ypical air-conditioning field wiring connections are shown in the diagram at right. FUA F0001A HOSA ODS II OLO OD 1 OO D HI HI (U OPIOAL) 7.3 LOI AI LAS AD/O POD FUA HUIDIFIS hese units operate at 10 V. our 0 V furnace is designed so that odel FK10 adaptor kit can be mounted inside the furnace to supply the required 10 V. Instructions for mounting and wiring are included with the kit. FK10 kit is not available for 83B 08 V three-phase models. 7. ILOK OIO hen the electric furnace is used in combination with another device (as for example, a wood burning furnace), it is recommended to perform the connection by referring to the wiring diagram at right. he burning furnace thermostat will then turn automatically on the blower in the electric furnace. Also, please note that orton has developped a low speed interlock kit; the FIK (Furnace Interlock Kit). his kit is specially designed to interlock the furnace operation with a ventilation fan or an HV unit. xternal equest for Fan Activation O elay O Furnace hermostat lectric Furnace System Furnace VA Power Output all for FA F003A - 7 -

8 8. II DIAAS isk of electric shock. Disconnect power before installation, servicing, maintenance or field wiring. eplace all panels before operating. Failure to do so can result in electric shock causing severe injuries or death. 1B10 odel Open: 93.3 P 1 P AP HA 1 HA IDIAO AP HA 1 O A K1 1 A 5 ecirculation ode lass ransformer Pri: 0 V 60 Hz Sec: V 60 Hz 0 VA 1 B VA OO OU ALL FO FA VA PO OU ALL FO HA 1 ALL FO HA 10 k 0 VA Single phase ritical characteristic 1. If any of the original wire, as supplied, must be replaced, use the same equivalent wire. iring must comply with applicable codes, ordinances and regulations.. Field wiring must comply with applicable codes, ordinances and regulations. Use only lass 1 wiring inside furnace compartments. Line voltage wiring: UL A 1015, 600V, 105, V-1, 8 A; UL A 1015/130, 600V, 105, V-1, 1 A; SA 600V, 105, F1, 8 A and 1 A. Low voltage wiring: same ratings as high voltage except 18 A. FA OO SPD OLO 1B15 odel AP AP AP O HA 3 HA HA 1 6 A 1 A A 5 For the use of a two-stage thermostat or an outdoor thermostat, connect between 1 and. For 1B15 model, make sure that the Season Select switch is set to ild position. 3 K 0V K VA A B 5 A 5 A B1 ecirculation ode HA IDIAO 1 B Season Select 15 k 0 VA Single phase lass ransformer Pri: 0 V 60 Hz Sec: V 60 Hz 0 VA Open: 93.3 P 1 P VA OO OU ALL FO FA VA PO OU ALL FO HA 1 ALL FO HA HI D-HIH D-LO LO K AP P B HA, B AK U D LD apacitor Heating lement ime Delay elay Fan elay Auto-eset hermal Protector anual-eset hermal Protector Fan otor erminal Block ransformer lass Heat 0 V Line Supply eutral Breaker Low power High power High power 8 A II OLO OD AK U O OA D HI F0061A - 8 -

9 8. II DIAAS (O D) isk of electric shock. Disconnect power before installation, servicing, maintenance or field wiring. eplace all panels before operating. Failure to do so can result in electric shock causing severe injuries or death. 1B18 & 1B0 odels F006A AP AP AP AP AP AP AP AP AP HA 3 HA O O HA HA 1 1B5 odel HA 5 HA HA 3 HA HA 1 K 0V VA K 0V VA A 6 A 6 A 1 A A A 1 A A 3 A1 5 3 A K1 3 1 A K1 3 1 A B1 B B B1 ecirculation ode B3 5 A 5 A ecirculation ode Open: 93.3 P 1 P Open: 93.3 HA IDIAO 1 B P 1 P Season Select lass ransformer Pri: 0 V 60 Hz Sec: V 60 Hz 0 VA Season Select lass ransformer Pri: 0 V 60 Hz Sec: V 60 Hz 0 VA 18/0 k 0 VA Single phase VA OO OU ALL FO FA VA PO OU ALL FO HA 1 ALL FO HA HA IDIAO 1 B VA OO OU ALL FO FA VA PO OU ALL FO HA 1 ALL FO HA 5 k 0 VA Single phase ritical characteristic 1. If any of the original wire, as supplied, must be replaced, use the same equivalent wire. iring must comply with applicable codes, ordinances and regulations.. Field wiring must comply with applicable codes, ordinances and regulations. Use only lass 1 wiring inside furnace compartments. Line voltage wiring: UL A 1015, 600V, 105, V-1, 8 A; UL A 1015/130, 600V, 105, V-1, 1 A; SA 600V, 105, F1, 8 A and 1 A. Low voltage wiring: same ratings as high voltage except 18 A. FA OO SPD HI D-HIH D-LO LO K AP P B HA, B OLO AK U D LD apacitor Heating lement ime Delay elay Fan elay Auto-eset hermal Protector anual-eset hermal Protector Fan otor erminal Block ransformer lass Heat 0 V Line Supply eutral Breaker Low power High power High power 8 A II OLO OD AK U O OA D HI For the use of a two-stage thermostat or an outdoor thermostat, connect between 1 and. ake sure that the Season Select switch is set to ild position.

10 8. II DIAAS (O D) isk of electric shock. Disconnect power before installation, servicing, maintenance or field wiring. eplace all panels before operating. Failure to do so can result in electric shock causing severe injuries or death. 1B7S odel AP AP AP AP AP AP HA 6 HA 5 HA HA 3 HA HA 1 A 6 3 A A 1 A A 3 A1 5 3 B1 B B3 Open: 93.3 P 1 P HA IDIAO VA OO OU ALL FO FA O K 0V VA 3 6 K1 1 A 5 ecirculation ode Season Select lass ransformer Pri: 0 V 60 Hz Sec: V 60 Hz 0 VA 1 B VA PO OU ALL FO HA 1 ALL FO HA 7 k 0 VA Single phase For the use of a two-stage thermostat or an outdoor thermostat, connect between 1 and. ake sure that the Season Select switch is set to ild position. Low power High power High power 8 A II OLO OD AK U O OA D HI FA OO SPD HI D-HIH OLO AK U K AP P B HA, LD apacitor Heating lement ime Delay elay Fan elay Auto-eset hermal Protector anual-eset hermal Protector Fan otor erminal Block ransformer lass Heat 0 V Line Supply eutral ritical characteristic 1. If any of the original wire, as supplied, must be replaced, use the same equivalent wire. iring must comply with applicable codes, ordinances and regulations.. Field wiring must comply with applicable codes, ordinances and regulations. Use only lass 1 wiring inside furnace compartments. Line voltage wiring: UL A 1015, 600V, 105, V-1, 8 A; UL A 1015/130, 600V, 105, V-1, 1 A; SA 600V, 105, F1, 8 A and 1 A. Low voltage wiring: same ratings as high voltage except 18 A. D-LO B Breaker LO D F0063A

11 8. II DIAAS (O D) isk of electric shock. Disconnect power before installation, servicing, maintenance or field wiring. eplace all panels before operating. Failure to do so can result in electric shock causing severe injuries or death. 83B13 odel L3 AP AP AP HA 3 6 HA HA 1 K 0V VA 1 A A 5 3 K1 3 1 A B 5 A 5 A B1 ecirculation ode lass ransformer Pri: 0 V 60 Hz Sec: V 60 Hz 0 VA Open: 93.3 P 1 P HA IDIAO 1 B VA OO OU ALL FO FA VA PO OU ALL FO HA 1 ALL FO HA 13.5 k 08 VA 3-Phase ritical characteristic 1. If any of the original wire, as supplied, must be replaced, use the same equivalent wire. iring must comply with applicable codes, ordinances and regulations.. Field wiring must comply with applicable codes, ordinances and regulations. Use only lass 1 wiring inside furnace compartments. Line voltage wiring: UL A 1015, 600V, 105, V-1, 8 A; UL A 1015/130, 600V, 105, V-1, 1 A; SA 600V, 105, F1, 8 A and 1 A. Low voltage wiring: same ratings as high voltage except 18 A. FA OO SPD HI D-HIH D-LO LO OLO AK U D 83B odel 83B7 odel L3 K 0V VA AP 7 k 08 VA 3-Phase AP AP AP AP AP HA 6 HA 5 HA HA 3 HA HA 1 K 0V VA K1 3 1 A A A1 A A A A 3 K1 3 1 A B3 B B1 ecirculation ode Season Select k 08 VA 3-Phase lass ransformer Pri: 0 V 60 Hz Sec: V 60 Hz 0 VA he wiring diagram for 7 k model is the same as the one for k model, except for the motor (illustrated at left). Open: 93.3 P 1 P HA IDIAO 1 B VA OO OU ALL FO FA VA PO OU ALL FO HA 1 ALL FO HA K AP P B LD apacitor Heating lement ime Delay elay Fan elay Auto-eset hermal Protector anual-eset hermal Protector Fan otor erminal Block ransformer lass HA Heat,, L3 Line Supply 08 V 3-Phase B Breaker Low power High power High power 8 A II OLO OD AK U O OA D HI For the use of a two-stage thermostat or an outdoor thermostat, connect between 1 and. ake sure that the Season Select switch is set to ild position. F0071A -11 -

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13 10. AIA OO: he motor is lubricated for life and needs no oiling. FILS: Size is 0 x 0 x 1 (508 mm x 508 mm x 5 mm). Should be inspected and replaced when dirty. Ordinarily replacement is required twice per heating season and, perhaps, a third time if continuous blower operation is used. O: ach element has an automatic reset thermal cut-out which is set to open at 160 F (71 ). If it opens, the element will be de-energized until the cut-out resets itself. In addition to that, there are manual reset thermal cut-outs that open at 00 F (93 ). If any of them open, a front panel needs to be removed so the cut-out can be manually reset. ut power supply (0 V or 08 V, according to the unit) before removing the front panel! 11. OUSHOOI he first step in identifying an operational problem is to determine whether the fault is in the furnace or in the thermostat and/or its connecting wiring. o help make this determination, the furnace is equipped with a hermostat O diagnostic light. If the light is O, it indicates the thermostat has closed and is calling for heat; the blower should be operating. If the light is OFF, the furnace should not be operating unless the IULAIO OD switch is set to run the motor continuously. 1. If the furnace will not start: urn the thermostat to its highest setting. If the light goes on, the thermostat has closed, so the fault is in the furnace. If the light does not go on, the thermosat or its connecting wiring is the problem.. If the furnace will not turn off: urn the thermostat to its lowest setting. If the light goes off and the furnace continues to run, the thermostat has opened properly and the problem resides in the furnace. If the light stays on, the fault is in the thermostat or its connecting wiring. After the fault area is isolated by use of the diagnostic light, a check of the following components can be made more efficiently. PO POSSI DFIV PAS O OPOS 1. he furnace will not turn on. hermostat ircuit breaker or fuse is open IULAIO OD switch (open contact) Bottom Sequencer ransformer. otor runs continuously. IULAIO OD switch is not on OFF position hermostat wires incorrectly attached to the furnace Bottom sequencer (the bottom heating element would also remain on) V elay 3. lements on, but motor does not run. otor or capacitor IULAIO OD switch (open contact) Bottom sequencer. otor going on and off in short cycles Heat anticipator in thermostat incorrectly set or may be defective (or in too long cycles) 5. he thermostat must be set much higher (or lower) he thermostat is not leveled or out of calibration than the desired house temperature 6. ot enough heat One or more defective elements or sequencers SASO SL switch set in ILD position Safety limits opening because duct obstruction or dirty filters are restricting air flow Defective or incorrect wired two-stage or outdoor thermostat Lack of enough cold air returns in house 7. wo-stage or outdoor thermostat not operating properly SASO SL switch not set in ILD position 8. otor goes off, but one or more elements stay on Sequencer 9. Automatic speed change doesn t occur when furnace heats up op sequencer 0 V relay 10. hermal cut-out opens Airflow is reduced because of blocked ductwork or very dirty filters 11. Breaker on front panel trips Overcurrent on heating element. eset the breaker. If problem persists, call an electrician