TestEquity FS Series - Page 16

Chapter 4 – Maintenance
Page 4-4 TestEquity FS Series Ovens
OTHER
HEATING light is on all the time
and temperature is running away
1. Adjust set point to room temperature. If the unit is still heating,
replace the solid state relay.
2. If cannot change any condition on the front panel, call Customer
Service.
Controller timer resets on its own
1. Confirm that power from wall is consistent and within
specifications.
2. Timer is defective.
Front panel displays are all off
1. Check connections to the temperature display control board and
assure that all are tight and in the correct orientation.
2. Check for wire damage.
Unit or wall fuse/circuit breaker is
blown
1. Check wall power source.
2. Compare current draw and compare to specs on data plate.
3. See what other loads are on the wall circuit.
Unit will not turn on
1. Check wall power source.
2. Check fuse/circuit breaker on unit or in wall.
3. See if unit is ON, e.g., fan or heater, and just controller is off.
4. Check all wiring connections, especially around the on/off switch.
Unit is smoking after initial
operation
1. This is not an uncommon occurrence when first operating new
units. Run at high temperature with vent open for one hour or until
smoke dissipates.
Contamination in chamber
1. See cleaning procedure.
2. Develop and follow standard operating procedure for specific
application; include definition of cleaning technique and
maintenance schedule.
Contamination on sample
1. See “Contamination in chamber”.
2. Reduce air flow in chamber by dampening down exhaust port; be
sure to verify adequate temperature uniformity at the reduced air
flow.
3. Protect open samples from areas of maximum air current, e.g.,
inlet air ducts.