Combi V3, Combi Max and Vortex Combi models
54
13 - FAULT FINDING
No water flowing from hot tap
Mains water supply is not connected to cold water inlet of boiler.
One or more isolating valves, stop cocks, etc. in the pipework are closed.
The cold water isolating valve in the boiler is closed.
There is a blockage (or blockages) in the pipework.
Hot tap is not connected to hot water outlet of boiler.
Insufficient flow of water through boiler.
Boiler cold water and hot water connections reversed.
Thermostatic mixing valve incorrectly fitted.
Pump is not operating in hot water mode.
Diverter valve microswitch(es) faulty.
Diverter valve microswitches not operated.
Diverter valve seized.
Diverter valve diaphragm failed.
Flow of water through boiler too high.
Boiler thermostat incorrectly set
Thermostatic mixing valve incorrectly set.
Faulty boiler thermostat.
Pump speed setting too low.
Pump is incorrectly fitted.
Burner not firing for hot water (after a short time).
Burner oil pressure set too low at oil pump.
Incorrect oil nozzle fitted to burner.
Check and rectify as necessary.
Open all valves in pipework to and from boiler.
Open valve (situated above pump in front of boiler).
Check and rectify as necessary.
Check and rectify as necessary.
Check flow is at least 3 litres/min - rectify as necessary.
Check and rectify as necessary.
Check hot and cold inlets are connected correctly.
Check operation of diverter valve.
Check pump is free to rotate and is vented.
Check for 230V supply to pump.
Check electrical continuity of pump microswitch.
Check wiring continuity from pump to microswitch.
Check switch continuity, replace if faulty.
Check diverter valve diaphragm.
Remove, dismantle and clean.
Replace diaphragm or complete diverter valve.
Reduce flow and check water temperature.
Set boiler thermostat to maximum.
Set mixing valve to setting '4.5'.
Check continuity and replace if necessary.
Set pump speed switch to maximum (top position).
Check and rectify as necessary.
Check operation of burner on central heating.
If burner faulty, refer to burner fault finding chart.
Check electrical continuity of burner microswitch.
Check electrical continuity of thermostat.
Check operation of diverter valve.
Check wiring continuity from burner to microswitch.
Check and set oil pressure to correct value (see Section 4.3, 4.4, 4.6).
Check and fit correct nozzle (see Section 4.3, 4.4, 4.6).
No hot water operation
FAULT
POSSIBLE CAUSE
ACTION
Hot water for short period only
Low water temperature at tap
Combi V3 and Combi Max only - Central heating OK - poor or no domestic hot water
13.3
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