Worcester GREENSTAR UTILITY 18/25 Instruction Manual page 44

8 716 106 256 C 03.10 30/3/10
PROBLEM
FAULTY BOILER
OPERATION:
Noisy operation
Boiling
Short Cycling
OIL SMELLS:
44
FAULT FINDING
14:24 Page 44
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 Temporarily 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
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 CF - Check flue with gauge and check
seals/gaskets
RS - Check seals/gaskets
Oil soaked boiler, faulty burner Rectify burner operation and lockouts
operation, numerous lockouts
Odour in boiler room, oil leaks Rectify oil leaks, replace components if
from pipework, flexible hoses necessary
connections
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR DANESMOOR UTILITY 18/25
FAULT FINDING
8 716 106 256C (03/2010)