Heidolph RotaChill User Manual
Page 31
110-509 HD/EN
30
Troubleshooting Chart
Problem
Possible Causes
Corrective Action
Unit does not run
(Digital Display is
blank)
No power to unit
Refrigerated units only
Electrical cord between
Control Head and
Refrigeration Power Module
loose or unplugged
Power Switch / Circuit
Breaker in OFF position
Check that the electrical cord is secure and
connected to an operating electrical outlet.
Check that the electrical cord is secure and
properly connected.
Place Power Switch / Circuit Breaker in ON
position.
Unit does not run
(STANDBY appears
on Digital Display)
Unit in Standby mode
Press Power Key on front panel.
No fluid circulation
Insufficient fluid in reservoir
Pump impeller jammed
Add fluid to reservoir.
Inspect pump and remove debris as required.
Insufficient circulation Fluid viscosity too high
External tubing diameter
too small
Low line voltage
Replace with lower viscosity bath fluid.
Replace with larger diameter tubing.
Check and correct as required.
Unit does not heat
Insufficient fluid in reservoir
Temperature set point too
low
Safety Set Temperature too
low
Add fluid to reservoir.
Increase temperature set point.
Increase Safety Set temperature.
Insufficient heating
Insufficient circulation
Low line voltage
Ambient temperature too
cool
Excessive heat loss
See Insufficient circulation, above.
Check and correct as required.
Increase ambient temperature or relocate unit.
Check for heat loss from external tanks and
hoses;
Check for vapor/heat loss from internal
reservoir.
Temperature
unstable
Insufficient circulation
Debris or mineral build-up
on pump, heater, or
temperature sensor.
Check pump flow and operation.
Clean as required.
Unit does not cool
Dust build up on air filter or
condenser
Blocked air ventilation
screens
Temperature set point is
too high
Excessive heat load
Ambient air temperature too
high (>35°C / 95°F)
Low or high line voltage
Clean air filter and/or condenser as required.
Remove blockages as required.
Decrease temperature set point.
Check that heat load does not exceed capacity
of bath; correct as required.
Decrease ambient air temperature.
Check and correct as required.