-121
3. No fans, lights, text and no
LCD back light (no nothing)
1. Verify circuit breaker is in the ON position
2. Verify AC power is present at outlet, i.e. plug
a known good item into outlet.
3. Check if the thermal snap switches are open.
If snap switches are open, verify chamber
fans are operating correctly. Replace
chamber fans.
4. Verify chamber fans are operational. If not,
replace 24VDC power supply.
5. Check cable from 24VDC supply to PDB.
6. PDB has failed, no 24 volt output. Replace
PDB.
4. No fans, lights, text and LCD
back light is ON
1. Verify chamber fans are operational. If not,
replace 24VDC power supply.
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