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FAULT FINDING
PROBLEM CAUSE REMEDY
FAULTY BOILER
OPERATION:
Noisy operation Pump noise from air in pump or
worn pump
Bleed air from pump or replace pump
Worn motor bearings Replace motor
Fan out of balance Replace fan
Boiling Faulty boiler thermostat Replace if necessary
Short circuit boiler thermostat Take out of circuit to check
Thermostat bulb not fully home in
pocket
Ensure bulb is pushed fully home
No primary water circulation Check system / circulating pump
Short Cycling Burner rating incorrect Correct burner rating
Boiler thermostat differential
incorrect
Replace boiler thermostat
External controls not operating
correctly
Check and correct external controls
OIL SMELLS: Blocked flue, fumes on startup Check seals/gaskets
Oil soaked boiler, faulty burner
operation, numerous lockouts
Rectify burner operation and lockouts
Odour in cabinet, oil leaks from
pipework, flexible hoses
connections
Rectify oil leaks, replace components if
necessary
FAULT FINDING
& DIAGRAMS
FAULT FINDING
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 113 389b (09/07)
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