High-Ef
fi
ciency Gas
2-17
As the probe temperature increases 1°F, the resistance increases by 2 ohms. A probe resistance/
temperature chart is provided in the Charts & Tables section. To check the performance of a
temperature probe, the probe’s reading should be compared to a measurement taken as near as
possible to the probe with an external thermometer or pyrometer.
Probe resistance can be checked from the 15-pin or 20-pin SMT controller plug. The probe
circuits are found by counting pin locations on the plug.
If the probe resistance exceeds the tolerance levels, below 1000
Ω
or above 1950
Ω
or a short is
detected on either wire, the controls will indicate the problem as follows:
Troubleshooting Probes
Ignition Failure
An alarm signal is sent and the gas valve is
shut off if the module’s microamp sensing cir-
cuit doesn’t con
fi
rm a
fl
ame in 4 seconds.
When the module locks out, 24VAC is sent
through the interface board alarm circuit to the
controller.
CMIII.5 controls display HELP; M2000 con-
trollers display Ignition Failure; 3000’s display
heat failure.
Microamps are measurable by placing a multimeter
capable of measuring microamps (not milliamps)
in series with the white sensing wire on the ignition
module. See output requirements for different igniton
modules on page 2-13.
Click to launch YouTube
video on microamp check.
Tips on Troubleshooting Ignition Failure
Take a multi-meter and manometer on every call.
Have the customer describe the speci
fi
c complaint.
Are clues to the problem inherent in the
complaint: happens during lunch hour, etc..
Eliminate components that are obviously working.
Operate the fryer and verify the problem.
Verify a
fl
ame is in the chamber when the fryer calls for re-ignition.
If no
fl
ame is present:
Check for power to the gas valve during the restart.
If
fl
ame is present in the chamber during call for ignition: Check for proper gas pressure
under high-volume conditions (lunch time).
Check microamp level (2.5 - 3.5 microamps for Honeywell module; 0.4 - 0.8 for Capable
Controls; 1.7-3.0 for Fenwal module) for each ignitor’s
fl
ame sensor.
Determine which side (left or right) is causing the failure. Use the LEDs on the interface to
determine faulty side.
Содержание FilterQuick Series
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