Troubleshooting - THERMODYNE 200NDNL International Service Manual

Problem
No Power
On/Off switch
illuminated but
controller will not
illuminate
Unit continuously shuts
down and requires fluid
replenishment
– Or –
Add Fluid light
illuminates every
couple of days
Add Fluid light is
illuminated but unit is
operating normally
Unit not reaching
desired temperature
OUT light illuminated
but unit not heating up
Some shelves heat
while others remain
cold
Extreme Electrical
Load, clicking noise or
controller turning on
and off
Loud Squealing Noise
Controller reads SBER
on top screen

TROUBLESHOOTING

Probable Cause
Main Power Switch Off
Unit not plugged in
Circuit Breaker off or tripped
Contactor Failure
Heater Tank fluid level low
Fluid Level Probe defective
Fluid leak
Reservoir Tank low on fluid
Controller not set to 189°F.
Defective Controller
Defective Solid State Relay
Defective or tripped Snap
Disc
Shelf or Delivery/Return
Hose is plugged.
Fluid Level in Heater Tank
low
Faulty Contactor
Defective Pressure Cap or
Pressure Cap Gasket
Defective Pump
Defective Thermocouple
Suggested Solution
Place Power Switch in ON position.
Ensure unit is plugged into a live receptacle.
Check and reset the Circuit Breaker.
Replace the Contactor.
Remove unit from power source and fill Heater Tank to Pressure
Cap neck with fresh Heat Transfer Fluid.
Determine which Fluid Level Probe is defective and replace it.
Remove the unit from power and remove the Power Head Lid
and Side Covers. Restore power and place the ON/OFF switch in
its ON position. Observe the unit for leaks. Repair leak and top of
fluid levels.
Top off Reservoir with fresh Heat Transfer Fluid.
Refer to Temperature Controller Set Up Procedures and set
temperature to 189°F.
Refer to Temperature Controller replacement procedure and
replace controller.
Refer to Solid State Relay replacement procedure and replace
relay.
Note: If relay LED is illuminated check Snap Disc.
Reset Snap Disc. If unit fails to warm up, replace Snap Disc.
Replace defective shelf or defective hose.
Note: Delivery and Return hoses are different lengths.
Remove unit from power and top off Heater Tank with fresh Heat
Transfer Fluid.
Replace the Contactor.
Replace the 16 PSI Pressure Cap.
Replace the defective pump referring to the pump replacement
procedures.
Refer to Thermocouple replacement procedure and replace the
Thermocouple.
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