Lang GCCO-T, Руководство по обслуживанию, Страница: 43 / 73

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TROUBLESHOOTING GCCO-C
To help troubleshoot the oven you should perform the following “Manual Override” test:
Open drop down door located on the lower right side, directly below front panel.
Turn back up toggle (on/off) switch to “on” position.
Turn main power switch to “on” position.
Check oven for normal operation.
NO DISPLAY
PROBABLE CAUSE CORRECTIVE ACTION
Power switch is not turned on
Turn power switch on.
Defective power switch Check power switch for normal operation. Replace as necessary.
Defective back-up relay Check relay for normal operation.
Check coil for 24 VAC.
If 24 VAC is measured. Turn oven off and:
Check coil for 80
Ω
.
Replace as necessary.
If 24 VAC is not measured.
Verify that manual override switch is in “off” position.
Check manual override switch for normal operation.
Check wires for any shorts.
Gas supply turned off Turn gas supply on and check for proper gas pressure. 5” water
column for natural gas and 10” water column for propane.
Pilot light fails to light Perform the following “trial ignition” and look and listen for spark:
Attempt to light the pilot burner. If the burner does not ignite
after 30 seconds, cycle power and repeat “trial ignition”. The
pilot may require several trials for ignition to bleed air from the
gas piping. After the ignition attempt, pilot should only require
2-5 seconds for normal start-up.
Spark observed Check for 24 VAC at pilot valve.
If 24 VAC is measured , turn oven off:
Check for pilot burner orifice blockage. Clean and repair as
necessary.
Perform trial ignition, as described in above section.
Replace gas valve.
If 24 VAC is not measured:
Check for 24 VAC at PV on spark module.
Check continuity on wire between PV on spark module and Pilot
Valve.