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airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8063
Experience:  Furnace, A/C and heat pump specialist.
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Ycc048-sf-13b Trane gas pack. Hoes through normal ignition

Customer Question

Ycc048-sf-13b
Trane gas pack. Hoes through normal ignition sequence but no pwr to gas valven, no ignition. Code 5 flashes: "flame sensed with gas valve off"
I found valve toggled off but when reset and valve On, it still goes to code 5.
Sensing rod and conductor ok.
Submitted: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

I would check all wiring connections an ground to board.If all are good, we get no 24v to gas valve, but a false flame error , the board we will need to be replaced.