33
221469B
Diagram 3.3
3 Fault Finding
Diagram 3.4
HONEYWELL
2313 S
2864 S
CONNECTION 'A'
CONNECTION 'E'
CONNECTION 'D'
CONNECTION 'B'
CONNECTION 'C'
BOILER
OVERHEAT
CUT-OFF
GAS VALVE
BOILER
OVERHEAT
CUT-OFF
CONNECTION "E"
CONNECTION "A"
SIT
Diagram 3.4
POINT "C"
CONNECTION "D"
CONNECTION "B"
GAS VALVE
With the boiler cold, check connections of the thermocouple, boiler overheat cut-off and gas valve.
Disconnect overheat cut-off connectors at points A and B at the gas valve, see diagram.
Test continuity of the overheat cut-off. Is there continuity ?
Faulty boiler overheat cut-off,
renew
Re-connect boiler overheat cut-off to points A
and B. Disconnect thermocouple at point D of the gas
valve. Test continuity between point C and the body
of the gas valve.
Is there Continuity?
Faulty cut-off connectors into gas
valve. Either at A or C.
Renew where Faulty.
Test continuity of thermocouple between inner
point D and point E.
Is there continuity?
Faulty thermocouple, renew.
Thermocouple and boiler overheat circuit
satisfactory.
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