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Fault-finding procedures
FAULT TABLE
Corrective measures
Problems
Condensation in chimney :
Smell of flue gas :
Insufficient heating :
Burner switches to safety mode after lighting :
Circulator :
Not enough hot water :
Circulator does not turn :
Burner does not light :
Manual reset safety thermostat has actuated :
Reasons
Chimney cold and/or not lined
1
Boiler T° set too low
2
Chimney blocked
3
Back draught in chimney
3
Boiler room vents insufficient or nonexistent
4
Boiler clogged
5
Burner clogged
5
Room thermostat T° set too low
6
Circulator blocked or faulty
7
Boiler switch in Summer position or faulty
8
Not enough water in the system
9
Radiator valves closed
10
Air in the system not vented properly
9
Gas pressure insufficient
11
Gas pipe too small
11
Boiler thermostat is faulty
12
Electrical system not earthed (properly)
13
The system fuses have blown
14
Air in the system and/or boiler not vented properly
9
Interval for large drawoff is too short
15
Drawoff flow rate is too high
15
Room thermostat not in demand or faulty
16
Summer/Winter switch faulty
17
On/Off switch faulty or not on
18
95 °C limit thermostat has activated
12
Manual reset safety thermostat has activated
19
Burner fan faulty
20
Lighting electrode faulty or badly adjusted
21
Ionisation electrode faulty or badly adjusted
21
Burner connectors not plugged in properly
22
Gas valve does not open
23
Boiler thermostat faulty
12
Air in top of boiler not vented properly
9