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boiler service, boiler repair, emergency repair
Worcester Greenstar Heatslave External 12/18 Boiler Fault Codes
BOILER LOCKOUT : Indicated by the illumination of the 'Lockout' indicator on the fascia. To reset, wait 2 minutes then press the lockout reset button.
| Problem | Cause | Remedy |
| Pulsation on start |
Combustion settings incorrect Faulty nozzle |
Set up as in installation instructions Replace nozzle |
| Intermittent lockout |
Bad electrical connection Intermittent flame detection fault |
Check control box/electrical connections See flame detection fault |
| Burner motor fails to operate |
Faulty motor or electrical supply to motor Control box fault |
Check for 230v at motor plug during startup period Replace control box |
| Flame detection fault |
Photocell filmed over (dirty) Photocell faulty Control box faulty |
Wipe clean Replace Replace |
| Incorrect CO2 |
Air adjustment fault Oil pressure incorrect |
Set up as in installation instructions Set up as in installation instructions |
| No oil from nozzle |
No oil at pump Air in pump Nozzle blocked Faulty pump or drive Faulty mechanical shut off valve (12/18 & 18/25 only) |
Check and refill oil tank/bleed oil line. Check and clean filters & valves from oil tank to boiler. Bleed pump Replace nozzle Replace Clean or replace
|
| Ignition failure |
Electrode settings incorrect Faulty ignition transformer Open circuit ignition Faulty control box or electrical connections not properly made
|
Set up as in installation instructions Replace Check and replace electrodes or high tension leads if necessary Correct control box electrical connections or replace control box
|
|
Burner fails to start |
No power to boiler Faulty boiler thermostat Programmer open circuit Faulty control box |
Check electrical / control circuit Check by temporarily linking out high limit and control thermostats Check by temporarily linking 8 & 9 on the connector Replace |
| High smoke number |
Air intake/flue blocked Incorrect combustion settings Oil pressure incorrect Incorrect components used on combustion head Faulty nozzle
|
Check & clear air intake/flue Set up as in installation instructions Adjust to correct pressure Check with installation instructions Replace nozzle |
| Noisy operation |
Pump noise from air in pump or worn pump Worn motor bearings Fan out of balance |
Bleed air from pump or replace pump Replace motor Replace fan |
| Boiling |
Faulty boiler thermostat Short circuit boiler thermostat Thermostat bulb not fully home in pocket No primary water circulation |
Replace if necessary Take out of circuit to check Ensure bulb is pushed fully home Check system / circulating pump |
| Short Cycling |
Burner rating incorrect Boiler thermostat differential incorrect External controls not operating correctly |
Correct burner rating Replace boiler thermostat Check and correct external controls |
| Oil smells |
Blocked flue, fumes on startup Oil soaked boiler, faulty burner operation, numerous lockouts. Odour in cabinet, oil leaks from pipework, flexible hoses connections |
Check seals/gaskets Rectify burner operation and lockouts Rectify oil leaks, replace components if necessary |