Hi-E2 350 heater trips thermal switch on exhaust collector after 10-15 minutes of run time. Went through the manual tested all gas and air pressures with digital differential manometer, adjusted to within spec, replaced the switch still trips. Anyone have any ideas?
Pool & Spa - Jandy - Laars Hi - E2 350,000 Btu Heater
Answers & Comments
Check the condition of the heat exchanger. If it is heavily sooted from prior to adjusting gas pressure it will not vent properly. Check for downdrafting or blockage in the flue pipe if the heat exchanger is not sooted.
If the heat exchanger is sooted a good steam cleaning or even a trip to a car wash should remove enough soot for it to return to operating normally.
Perhaps then you could note what else you have checked??
Either the sensor is faulty (you already replaced it) or there is a condition in the heater causing the sensor to trip for safety reasons.