Manual Part No: 931760-01 MV1 Gas Fryer
- 22 –
Manual Rev No: 1
Service and Maintenance (cont.)
Fault Finding
Fault Possible
Cause
Remedy
High Limit Thermostat has tripped
Reset high limit thermostat. Check
calibration of operating thermostat, as this
may be too high causing the high limit to
trip. Operating thermostat should cut off
the main burners at 180ºC when set to
maximum temperature. If operating
thermostat calibration is satisfactory, check
high limit thermostat calibration as this may
be set too low causing it to trip or become
sensitive to vibration. High limit thermostat
should cut at approximately 216-218ºC.
The oil temperature must not overshoot
above 230ºC.
Faulty High Limit Thermostat (open circuit)
Replace
Faulty thermocouple (low milli-voltage).
Replace.
Faulty wiring or connections between
Thermocouple and High Limit Thermostat.
(no continuity)
Check wires and connections.
Repair/replace as required.
Pilot will not establish.
Thermocouple tip not correctly aligned with
pilot flame or pilot flame too small. (low
milli-voltage)
Clean or re-adjust as required
Pilot misalign with main burners (poor cross
lighting)
Check and adjust as required to ensure
satisfactory cross lighting.
Pilot flame too small (poor cross lighting)
Check clean/ re-adjust to ensure
satisfactory cross lighting.
Explosive Ignition when
main burners light
Gas pressure too low
Investigate cause and correct.
Is gas valve turned to on position?
Rotate knob to on position.
Thermopile failure
Check milli-voltage
Open circuit 300MV plus
Closed circuit 100MV plus
Pilot flame too small or not burning
correctly(low milli-voltage from T/pile
Check/adjust or replace pilot assembly as
required.
Thermostat failure contacts open or
thermostat worn or damaged
Replace Thermostat
Pilot establishes but
main burners will not
light.
Wiring fault or loose connection in
thermostat or thermopile circuits.
Check/ repair or replace as required.
If main burners can not be turned on and off
with the thermostat control knob. Then
suspect a failed capillary tube.
Replace Thermostat
Main Burners remain on
If main burners can not be turned on and off
with control thermostat knob. Suspect an
open circuit connection.
Repair
