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29
221098C
Diagram 8.5
Closed Circuit Voltage (millivolts)
DIAGNOSIS GRAPH FOR FIRE
THERMOCOUPLE CIRCUIT
Open Circuit Voltage (millivolts)
0
1
2
3
4
5
6
7
8
9
10 11
7
8
9
10
11
12
13
14
15
16
17
A
B
C
0065M
8.3 Thermocouple
To test a thermocouple, a meter with a range of 0 to
30mV is required together with a thermocouple
interrupter test unit, similar to a British Gas Multimeter 6
unit.
Refer to fault finding diagram 8.4 and diagnosis graph,
diagram 8.5.
8.4 Combustion Products Discharge Safety
Device
If the device operates it indicates there could be a
problem with the chimney or, the pilot filter in the gas
tap is blocked. First make sure air vents are free
from obstructions, by carrying out spillage checks as
Section 5.5. If all is in order refer to diagram 8.3 to
check if the pilot filter is blocked.
8 F a u l t F i n d i n g