On a Hot Surface Ignition (HSI) system what can cause intermittent operation?
Items that can cause intermittent operation or nuisance lockouts on an HSI system are: Carbon deposits on the flame probe which can be cleaned with emery cloth, a poorly grounded furnace, reversed polarity on the primary or secondary of the transformer. You can obtain specific instructions for wholesale HSI models from our Website. For original equipment models troubleshooting instructions may be available from the heater manufacturer.
