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Combi V3, Combi Max and Vortex Combi models
13 - FAULT FINDING
Combi V3, Combi Max and Vortex Combi - Boiler faults on central heating and hot water - continued
13.2
Flue is blocked.
Insufficient flue draught.
Flue pipe or liner is too large or existing stack is unlined.
Insufficient combustion air supply to burner.
Insufficient combustion air supply to burner.
Incorrect or faulty nozzle fitted.
Fuel pressure too low.
Oil leak in supply line or burner.
Leak around boiler cleaning door.
Burner not correctly fitted on mounting flange.
Burner seal 'O' ring damaged or missing.
Leakage around flue connection.
Faulty boiler thermostat.
Thermostat sensor not connected to PCB (Vortex Combi only).
Faulty overheat thermostat.
Check flue is clean and unobstructed - rectify as necessary.
Check flue draught and improve flue as necessary.
Check flue condition/size and alter as necessary.
Check as for high smoke number (above).
Check that an extract fan is not pulling combustion gases from burner.
Check as for high smoke number (above).
Check nozzle size and type and replace if necessary.
Check fuel pressure and adjust as necessary.
Check all joints and flexible hose for leaks and rectify as necessary.
Check gasket, re-tighten nuts or replace gasket as necessary.
Remove and re-fit burner ensuring correct fitting.
Check and replace 'O' ring as necessary.
Check and re-seal flue as necessary.
Check and replace as necessary.
Check and rectify as necessary.
Check and replace as necessary.
FAULT
POSSIBLE CAUSE
ACTION
Fumes and puffing on starting
(Conventional flue)
Overheat thermostat operating
Combustion fume smells
Oil smells
Flame slow to stabilise on starting
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