Fault Diagnosis - Thetford SOH70 Z Series User And Installation Instructions Manual

10. Removing Drop Down Oven Door
Open the door and engage catch to hook on each hinge. Lift the door and pull out of
front trim.
If required the door inner glass may be removed for cleaning by sliding out vertically
from its retaining channels.

FAULT DIAGNOSIS

FAULT
HOB
Burner will not adjust
(continuous on low or high
flame).
Burner sooting.
Burner – no Spark Ignition
Discoloured panrest
Burner will not remain lit
GRILL
Burner will not stay lit
Low flame
Flame 'floating'
Will not light but spark
ignition working
CAUSE
Gas pressure
Blocked jet
Control tap
Gas pressure
Power supply
Poor connection
Spark generator
Not a fault
Thermocouple
failure.
Blocked jet
Misaligned parts
Thermocouple fault
Solenoid fault
Blocked jet
Gas flow
Blocked jet
Control tap
Gas flow
Spark probe position
15
SOLUTION
Check gas pressure correct
Clear blockage from jet.
Check jet size correct
Inspect/test control tap
Check pressure, low pressure is the cause of
sooting.
Check power supply
Check all connections
Test spark generator
Earth leakage due to damaged wire
Discolouration is unavoidable. Chrome
panrests are more susceptible to discolouration
Test & replace thermocouple if required
Check thermocouple in flame path
Clear jet blockage
Check thermocouple in flame path
Thermocouple, test & replace if required
Control tap solenoid - remove, clean, inspect &
test.
Clear jet blockage.
Check gas pressure correct
Clear blockage
Inspect/test control tap
Check jet holder not misaligned to burner.
Check no obstructions to flue
Check sparking against burner
Gap between spark probe end & burner should
be 3mm to 4mm and located adjacent to notch
in run around plate.
Check jet not blocked.