15
conditions.
Display and reference
thermometer don’t match
1/ Calibration error – see section 6.4.
2/ Temperature sensor failure – call Customer Service.
3/ Controller failure – call Customer Service.
4/ Allow at least two hours to stabilize.
5/ Verify that reference thermometer is certified.
Can’t adjust set points or
calibration
1/ Turn entire unit off and on to reset.
2/ If repeatedly happens, call Customer Service.
Calibrated at one temperature,
but not at another
This can be a normal condition when operating
temperature varies widely. For maximum accuracy,
calibration should be done at or as close to the set point
temperature.
MECHANICAL
Motor doesn’t move; F suffix
models
1/ If shaft spins freely: check connections to motor and
check voltage to motor.
2/ If shaft rubs or is frozen, relieve binding and retest.
Motor makes noise; F suffix
models
1) Make sure that the fan or blower wheel is not contacting
its housing. Adjust the motor mounting bracket position to
re-center the fan or blower wheel, if necessary.
2) Check the fan or blower wheel for damage or out of
balance condition. Replace the fan or blower wheel if it is
damaged or out of balance.
3) Turn the motor shaft to make sure that it spins freely. If it
binds or the bearings make a rubbing or scrapping sound
then replace the motor.
Door not sealing
1/ Adjust hinge blocks or twist the door.
2/ Confirm that unit has not been damaged and body is not
out of square.
3/ Check physical condition of gasket for tears or
punctures.
OTHER
Controller on at all times –
“locked-up”
1/ Adjust set point to room temperature. If the unit is still
heating, replace the solid state relay.
2/ Turn unit off and on to reset.
3/ If cannot change any condition on the front panel, call
Customer Service.
