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Brian
Brian, HVAC Technician
Category: HVAC
Satisfied Customers: 840
Experience:  OFTEC registered oil heating engineer and plumber.
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Ducted gas heater will start when cold but after a couple of

Customer Question

Ducted gas heater will start when cold but after a couple of off and on it won't fire up again Went outside fan turns off and on but gas won't fire up
Submitted: 2 years ago.
Category: HVAC
Expert:  Brian replied 2 years ago.
The problem could be a flame sensing failure most commonly caused by a dirty flame sensor rod.. use *plumbers sand cloth* to polish it. You can find it by following the 'sense wire' from the honeywell ignition system.. its a long stainless steel rod protruding from a white ceramic insulator.
Best regards
Brian