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Have Ruud natural gas furnace and the gas valve opens after…

Customer Question
Have Ruud natural gas...

Have Ruud natural gas furnace and the gas valve opens after the purge does its thing and only stays on for approx 3-5 seconds. Then goes off. The flame rod sensor light never comes on. Changed the rod with an working one and the board with a working one but same results.

Contractor's Assistant: Did you double-check the thermostat? And what about the pilot light?

Pilot ignites properly and also installed new Thermostat.

Contractor's Assistant: Do you plan on doing the work yourself?

I am a service Tech but I have never had this happen as I can recall.

Contractor's Assistant: Anything else we should know to help you best?

This unit is set up as to have the gas furnace as the secondary heat source with a heat pump being the primary.

Submitted: 6 months ago.Category: HVAC
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Answered in 20 minutes by:
12/17/2017
HVAC Technician: airheatman, HVAC Technician replied 6 months ago
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 9,171
Experience: Furnace, A/C and heat pump specialist.
Verified

Give me a few more details. What is model on furnace? Do you have your meter so we can check the micro amp reading on the flame rod? See video below?

https://www.youtube.com/watch?v=a5u044OJBc4

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