Table of Contents
Advertisement
9.1 Pilot
Refer to chart 9.1.
9.2 Thermocouple
Refer to chart and diagram 9.2.
9.3 Electrical
Refer to diagram 9.3 and 9.4.
The preliminary electrical system checks as contained in a
multimeter instruction book are the first checks to be carried out
during fault finding.
On completion of any fault finding task which has required the
breaking and remaking of electrical connections then the checks,
earth continuity, polarity and resistance to earth, must be
repeated.
With the boiler cold, check connections of the thermocouple, boiler flue blockage safety device
and gas valve. Reset flue blockage safety device.
Disconnect flue blockage safety device connectors at points A and B at the gas valve,
see diagram Interrupter Electrical Connections.
Test continuity of the flue blockage safety device. Is there continuity?
YES
Re-connect boiler flue blockage
safety device to points A and B.
Disconnect thermocouple at
connection point D of the gas valve.
Test continuity between point C and the
body of the gas valve.
Is there continuity?
NO
Test continuity of thermocouple between inner
connection point D and point E.
Is there continuity?
YES
Thermocouple and boiler flue blockage
safety device circuit satisfactory.
THERMOCOUPLE FAULT FINDING
PERMANENT
LIVE
230V
50Hz
3A FUSE
FUNCTIONAL FLOW WIRING
221787B
Supplied By www.heating spares.co Tel. 0161 620 6677
9 Fault Finding
9.4 Flue Blockage Safety Device
If the device operates it indicates there is a problem with the
chimney. Make sure that the air vents are free from obstruction.
Carryout spillage checks as Section 2.3.
If replacement parts are required, apply to your local supplier.
YES
NO
C
NC
L RED
THERMOSTAT
18
NO
Faulty boiler flue blockage
safety device, renew.
Faulty flue blockage safety device
connectors into gas valve,
either at A or C.
Renew where faulty.
Faulty thermocouple, renew.
MULTI-FUNCTIONAL
CONTROL
BROWN
3
4
SOLENOID
2327/B
Diagram 9.2
BLUE
N
Diagram 9.3
Advertisement
Table of Contents
