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The main indicator of a gas or electrical circuit problem is that an entire battery of fryers fails to
light. Verify that the quick disconnect fitting on the flexible gas hose is properly connected, the
fryer is plugged in, and the main gas supply valve is open.
1.9.3 Problems Related to the Electrical Circuits
If gas is being supplied to the fryer, the next most
likely cause of ignition failure is a problem in the
millivolt circuit of the pilot system. If the fryer is
equipped with a Filter Magic II filtration system,
first verify that the drain valve is fully closed. (The
valve handle interacts with a microswitch that must
be closed for power to reach the gas valve. Often,
although the valve handle appears to be in the
closed position, the microswitch is still open.) If
the valve is fully closed, or the fryer does not have a
filtration system, refer to the troubleshooting
guides.
The flat on the drain valve
handle must firmly engage the
flexible arm on the microswitch
to allow the burner to fire.
The drain valve handle interacts with a microswitch that
prevents the burner from firing if the drain valve is open.
1.9.4 Problems Related to the Gas Valve
If the problem is not in the millivolt circuit of the pilot system, it is most likely in the gas valve it-
self. Follow these steps to check a Honeywell valve:
1. Complete System Check: With the thermostat
contacts closed and gas cock dial “ON,” main
burner should ignite. If not measure across ter-
minals 2 and 3 as indicated by the diagram. If
the reading is more than 180MV, replace the gas
valve.
2. System Resistance Check: With the thermostat
contacts closed and main burner “ON”, measure
the millivolts between terminals 1 and 3 as
indicated by the diagram. Reading should not be
greater than 220MV, If greater, re-check
thermostat leads and connections. Replace with
new or heavier gauge wires if necessary. If the
reading is still greater than 220MV, replace the
thermostat.
4
2
3
1
Test
Meter
Setting
Meter Leads
on Terminals
Acceptable
Results
1 MV 2 3 Less than 180MV
2 MV 1 3 Less than 220MV
3 MV 1 2 110-36 MV
3. Automatic Pilot Dropout Check: With the thermostat contacts open, depress gas cock knob
with pilot lit until maximum millivolt output is observed between terminals 1 and 2. Extinguish
the pilot and observe the meter. The sound of the pilot magnet dropping should be audible. The
dropout should occur between 110 MV and 36MV. If the dropout occurs outside those limits,
replace the gas valve.