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TROUBLESHOOTING GCCO-T CONT’D
PROBABLE CAUSE CORRECTIVE ACTION
Igniter continues to spark after
pilot is lit
Check pilot for strong flame and good contact with sensor.
Check sense wire for 12 to 13 micro amps on spark module. (Johnson
Control spark modules use “#4” terminal and Channel spark modules
use “Sense” terminal).
Turn oven off and check sense wire for continuity.
Replace sense wire or spark module as necessary.
Defective Module Confirm that there is a pilot ignition.
Check for 24VAC at “MV” to ground.
Defective Isolation Transformer Confirm that transformer is getting voltage.
Check transformer for normal operation.
Defective Door switch Confirm that Door switch is getting voltage.
Check door switch for normal operation.
Defective Motor relay Confirm that motor relay is getting power.
Check motor relay for normal operation. (24 VAC 39 Ω)
Defective Motor Confirm that motor is getting power.
Check motor for normal operation. (HIGH: P1-T7,T4) (LOW: P1-T9)
NO HEAT
NOTE: The motor needs to be operational before the oven will start heating.
PROBABLE CAUSE CORRECTIVE ACTION
Defective Thermostat
Confirm that Thermostat is getting 24 VAC. Measure between
Thermostat terminal and “D” on the terminal block
If voltage is not present:
Check Transformer for normal operation.
If voltage is present:
Check thermostat for continuity.
Replace as necessary.
Defective Centrifugal Switch Confirm that when motor is running that there is continuity through
Centrifugal switch.
Defective Hi Limit Thermostat Check Hi Limit Thermostat for continuity.
Defective Solenoid Valve Confirm that Valve is getting voltage.
Check Valve for normal operation.
Plugged Main Burner Orifice Clean orifice.
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