DOMESTIC HOT WATER Follow operational sequence Turn Winter/Summer selector to Summer position. The display is switch on. Go to section A Error 110 flashing Error 131 flashing Turn the selector to reset If the error 110 is still flashing Go to section J Error 20, 28 or 50 flashing Go to section E Error 119 flashing Go to section C Turn DHW thermostat to max. Open DHW tap fully. DHW flow sensor operated (red neon on the sensor illuminated) Is mains water filter and assembly clean. Is the magnetic detector well assembled DHW flow rate more than 2 l/min. Go to section G 3 way valve is addressed towards DHW circuit Go to section K Pump runs Go to section B Error 125 flashing Fan runs Error 160 flashing Go to section D Fan runs at correct speed Error 160 flashing Go to section L Fault finding PRIME HT PROMAX COMBI HE PLUS pag. 1/8
DOMESTIC HOT WATER Follow operational sequence (continue) Spark at ignition electrodes for up to 5 seconds and for 3 attempts Go to section H Turn the selector to reset Burner lights Go to section F Burner does not stay alight after 5 sec. Go to section I Burner output modulates to maintain the temperature set Reduce DHW flow rate Burner modulates Clean DHW NTC sensor and DHW heat exchanger Error 130 flashing Go to section M Close DHW tap DHW flow sensor senses no flow. Burner goes out Fan stops after 10 seconds Pump runs for 30 seconds Operation sequence successful Fault finding PRIME HT PROMAX COMBI HE PLUS pag. 2/8
CENTRAL HEATING - Follow operational sequence Turn Winter/Summer selector to Winter position. The display is switch on. Go to section A Error 110 flashing Turn the selector to reset If the error 110 is still flashing Go to section J Error 20, 28 or 50 flashing Go to section E Error 119 flashing Go to section C Turn Central Heating thermostat to max. Pump runs Ensure controls are set to demand and verify the contacts are closed External controls calling for heat and internal clock calling for heat Go to section B Error 125 flashing 3 way valve is addressed towards CH circuit Go to section K Fan runs Error 160 flashing Go to section D Fan runs at correct speed Error 160 flashing Go to section L Fault finding PRIME HT PROMAX COMBI HE PLUS pag. 3/8
CENTRAL HEATING - Follow operational sequence (continue) Spark at ignition electrodes for up to 5 seconds and for 3 attempts Go to section H Turn the selector to reset Burner lights Go to section F Burner does not stay alight after 5 sec. Go to section I Burner output modulates to maintain the temperature set Check the CH NTC sensor Go to section E Error 130 flashing Go to section M Burner goes out Fan stops after 10 seconds Pump continues to run for 3 minutes (room thermostat open) Operation sequence successful Fault finding PRIME HT PROMAX COMBI HE PLUS pag. 4/8
FAULT FINDING SOLUTION SECTIONS A Check line voltage at: Main terminals L and N Check electrical supply Main terminal fuse Replace fuse 3. PCB X1 connector terminals 1,2 Check wiring Boiler working display illuminated B Check line voltage at: Pump If pump jammed, release Replace pump PCB X3 connector terminals 3,4 Change pump supple cable C Central Heating system pressure < 0,5 bar Re-pressurise system Check connection water pressure switch terminal COM and PCB connector X400 terminals 3,4 Replace water pressure switch Check the tap of the automatic air vent is opened Open the automatic air D Fan connections correct at fan. PCB X2 connector is 230 V AC across terminals 3,4 Fan jammed or faulty winding Replace fan Fault finding PRIME HT PROMAX COMBI HE PLUS pag. 5/8
E Temperature sensors faulty. Cold resistance 10 kω @ 25 C (DHW and CH sensors) 20 kω @ 25 C (FLUE sensor) (resistance reduces with increase in temp.) Replace sensor F Check and correct the connexion of the silicon tube between the fan and the gas valve Gas at burner Ensure gas is on and purged PCB X3 connector is 230 V AC across terminals 1,2 Replace gas valve G Check and correct: the position of the electronic sensor on the hydraulic group of the gas boiler the connexion between the PCB X400 connector terminals 3,6,7 and the electronic sensor Check the voltage between (Vcc red wire) and GND (blue wire) is more than 5 VDC Replace the electronic sensor H Check and correct: Ignition electrode and lead Electrode connection 3. Spark gap and position Voltage at main PCB X2 connector is 230 V AC across terminals 2,5 Check wiring Replace igniter Fault finding PRIME HT PROMAX COMBI HE PLUS pag. 6/8
I Check the gas supply pressure: For Natural Gas > 10-11 mbar Check and correct: the mechanical set of the gas valve (CO2 values - see instruction) Flame sensing electrode and lead connections 3. Flame sensing electrode position Flame current should be more than 0,5 μa Replace flame sensing electrode J Overheat thermostat operated or faulty, i.e. continuity across thermostat terminals Allow to cool. Continuity across thermostat terminals more than 1,5 ohm Replace the thermostat K Check line voltage at: Motor 3 way valve Replace motor 3 way valve PCB X3 connector terminals 5,6 central heating function 5,7 DHW function Change motor supple cable L Fan connections correct at fan. PCB X401 connector terminals 5,6,7,8 Check if the setting of the pcb is correct. (See the list of parameters Instruction for Replace fan Service) Fault finding PRIME HT PROMAX COMBI HE PLUS pag. 7/8
M Temperature sensors faulty. Cold resistance 10 kω @ 25 C (CH sensor) 20 kω @ 25 C (FLUE sensor) (resistance reduces with increase in temp.) Replace sensor If pump is running the exchanger could be obstructed Replace exchanger Fault finding PRIME HT PROMAX COMBI HE PLUS pag. 8/8