THERMODYNE 742HW, Installation & Operation Manual

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TROUBLESHOOTING
Most problems associated with the holding cabinet are due to low fluid level.
Always check fluid level first.
PROBLEM POSSIBLE CAUSE SOLUTION
No Power
1. Main power switch off.
2. Not plugged in.
3. Breaker off or tripped.
4. Bad contactor. 1. Turn switch on.
2. Check plug.
3. Check breaker.
4. Replace contactor.
LOW FLUID light is on –
Oven heating properly 1. Oven is low on fluid. 1. Add Thermodyne Heat Transfer Fluid
per instructions.
LOW FLUID light is on –
Oven not heating properly
1. Oven disabled due to low fluid
level cut out.
2. Fluid level probe defective.
3. System leak.
1. Main heater tanks low on fluid. Add
Thermodyne Heat Transfer Fluid and
determine cause of fluid loss.
2. Repair or replace.*
3. Repair leak.*
Heater(s) not working
1. Unit not properly wired.
2. Bad heater(s).
3. Contactor or solid state relays
not working.
4. Off due to low fluid cut out.
5. Failed temperature controller.
6. High limit snap disc tripped.
1. Check wiring.*
2. Replace heater(s).*
3. Repair or replace.*
4. Add Thermodyne Heat Transfer Fluid
per instructions.
5. Replace temperature controller.*
6. Reset snap disc and check for cause.*
Shelves hotter than
set point
1. Temperature controller out of
calibration.
2. Thermocouple defective.
3. Solid state relay(s) stuck on.
4. Failed temperature controller.
1. Recalibrate temperature controller.*
2. Replace thermocouple.*
3. Replace solid state relay(s).*
4. Replace temperature controller.*
Shelves colder than
set point
1. Low fluid in tank. (LOW FLUID
light should be lit)
2. Failed temperature controller.
3. Heater(s) not working.
4. Pump failure.
5. Thermocouple failure.
1. Add Thermodyne Heat Transfer Fluid
per instructions.
2. Replace temperature controller.*
3. See “Heater(s) not working”.
4. Repair or replace pump.
5. Replace thermocouple.
Oven heats up too slow 1. Heater(s) not working. 1. See “Heater(s) not working”.
*Recommended service to be done by a qualified service agency.
NOTE: Most problems associated with the Thermodyne cabinet are due to failure to add Thermodyne
Heat Transfer Fluid. Check fluid level first. In the event service is required on your Thermodyne
cabinet, please call: (800) 526-9182.