Worcester 12/18 Instruction Manual page 49

8 716 113 389d 30/3/10 14:01
PROBLEM
FAULTY BOILER
OPERATION:
Noisy operation
Boiling
Short Cycling
OIL SMELLS:
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32
8 716 106 389c (01/2009)
Page 49
CAUSE REMEDY
Pump noise from air in pump or Bleed air from pump or replace pump
worn pump
Worn motor bearings Replace motor
Fan out of balance Replace fan
Faulty boiler thermostat Replace if necessary
Short circuit boiler thermostat Take out of circuit to check
Thermostat bulb not fully home in Ensure bulb is pushed fully home
pocket
No primary water circulation Check system / circulating pump
& tank overheat thermostat
Burner rating incorrect Correct burner rating
Boiler thermostat differential Replace boiler thermostat
incorrect
External controls not operating Check and correct external controls
correctly
Blocked flue, fumes on startup Check seals/gaskets
Oil soaked boiler, faulty burner Rectify burner operation and lockouts
operation, numerous lockouts
Odour in cabinet, oil leaks from Rectify oil leaks, replace components if
pipework, flexible hoses necessary
connections
FAULT FINDING
FAULT FINDING
49