57
Combi V3, Combi Max and Vortex Combi models
13 - FAULT FINDING
Vortex Combi only - Domestic hot water OK - poor or no central heating
13.6
No operation of boiler on
heating
Boiler switch is set to OFF.
Heating switch is set to OFF.
Room thermostat (if fitted) not calling for heat.
Timeswitch either not set or not in an ON period.
Timeswitch not operating.
Faulty timeswitch.
Faulty timeswitch contacts.
Faulty room thermostat.
No room thermostat or external timeswitch fitted.
Faulty Heating PCB sensor.
Faulty Heating PCB.
Faulty relay No. 2.
Boiler temperature control set too low.
Heating pump speed too low.
Heating pump not operating.
Primary store sensor not operating correctly.
Faulty relay No. 1.
Check boiler On/Off switch is set to ON (on boiler control panel).
Check heating switch is set to TIMED.
Set thermostat to call for heat and check boiler operates.
Check setting and set to CONSTANT to check boiler operates.
Check power supply to timeswitch.
Check and replace as necessary.
Check continuity of switch and replace as necessary.
Check continuity of thermostat and replace if necessary.
Check links are fitted between terminals 4 & 5 and 8 & 9.
Replace sensor and check operation.
Check for 230 V output from BURNER LIVE terminal.
If no 230 V output - replace PCB.
Check for 230 V supply to burner - between terminals 20 & 21.
Check for 230 V supply to heating pump - between terminals 14 & 15.
Check and set as necessary.
Check pump speed and set as required.
Check for 230 V supply to pump.
Check sensor is correctly located in pocket on front of store.
Check sensor lead is correctly connected to Hot Water PCB.
Check for 230 V supply to Hot water pump.
FAULT
POSSIBLE CAUSE
ACTION
Flow temperature low
Little or no heating flow
ATTENTION
If either sensor is disconnected from it's respective PCB, then that PCB will operate as if a demand was present and supply 230
V from the BURNER
LIVE terminal producing the following conditions:
Heating PCB sensor disconnected - Burner and heating pump will run continuously until the limit thermostat operates to shut down the boiler.
Store (hot water) PCB sensor disconnected - Burner and store pump will run until Heating PCB stops burner (via sensor on flow pipe). Store pump
continues to run. Note: - The boiler cannot provide flow to heating system in this condition - but will continue to provide hot water (and re-heat the
primary store) as required.
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