FAULT FINDING

ELECTRICITY SAFETY - Switch off electrical supply to unit before making any electrical tests.

FAULT

POSSIBLE CAUSE

ACTION

BURNER WILL NOT START

Boiler Thermostat or other

 

system controls satisfied

 

Fuse blown

 

for short circuit in wiring

 

No gas/pressure low

Ensure all controls are calling for heat

Fit new 5 amp fuse, if it blows again check

Ensure all isolation valves are open and minimum gas pressure on inlet is 17/20 mbar.

 

Blocked Flue Neon illuminated

Press the reset button on lower control

 

 

panel. NB Only try twice

 

 

Ensure flue is not blocked and minimum

 

 

draught of 0.04”WG

 

 

Ensure bulb for thermostat is in pocket.

 

Poor Earth

Check earth continuity and all earths connected.

 

 

 

FAN DOES NOT RUN

Connections

Check connections and plugs 24DC 230V

NO FAN NOISE

 

 

 

Gas Valve solenoid

Touch coil with non magnetic screwdriver,

 

 

if not magnetic replace gas valve

 

 

 

BURNER IGNITES

Live and neutral reversed

Check polarity

MOMENTARILY THEN GOES

 

 

TO LOCKOUT

 

 

 

Ionisation probe incorrect

Adjust gap to that specified

 

Ionisation probe damaged

Replace probe

 

Ionisation probe lead damaged

Repair/replace

 

Poor earth to unit

Check continuity and all earth connections

 

Control box wiring faulty

Check control box wiring and wiring

 

 

into molex

 

Venturi throttle setting excessive

Check combustion figures are to spec

 

 

 

BURNER IGNITES AND THEN

Low/No gas pressure

Check supply pressure

GOES OUT AFTER A FEW

 

 

MINUTES

 

 

 

Breakdown in ionisation circuit

Check ionisation circuit whilst running is

 

 

above 0.9 µa DC

 

 

 

BURNER FAN RUNS

Damaged ignition electrode

Replace electrode

BUT DOES NOT IGNITE

 

 

 

Ignition lead not connected

Reconnect leads/replace

 

/damaged

 

 

Ignition spark excessive

Reset spark gap to specified 3mm

 

Ignition control not seated

Ensure control located correctly and pins

 

on gas valve

not bent

 

Ignition control box faulty

Replace

38

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Honeywell Central Heating Cooker Natural Gas manual Fault Finding

Central Heating Cooker Natural Gas specifications

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