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My furnace is short cycling. It's an efficient vacuum pump…

Customer Question
Hello, my furnace is short...
Hello, my furnace is short cycling. It's an efficient vacuum pump model. Runs as should, vacuum pump, blower, hot surface ignition, flame, but it only runs about 8 minutes then shuts down with the continuous flashing red light. Until it starts the cycle again in a few minutes. House just doesn't get as warm as I have the thermostat. I sandpapered the flame sensor. It appeared clean anyway.
Submitted: 2 years ago.Category: HVAC
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Customer reply replied 2 years ago
Is anybody going to have some response soon?
Answered in 2 hours by:
1/18/2016
HVAC Technician: airheatman, HVAC Technician replied 2 years ago
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 9,346
Experience: Furnace, A/C and heat pump specialist.
Verified

Can you give me complete model from inside furnace in burner compartment so I can provide guidance with this specific unit.Model will be on a label just above burners on right or left inside panel

http://i.imgur.com/U8b0GXT.jpg

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Customer reply replied 2 years ago
KG6RA 072C-12A
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Excellent, now while I am pulling a service manual, tell me if there is a flashing light on control board and if so pattern of flash.

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Customer reply replied 2 years ago
It'll run the normal cycle. Then kicks off. Continuous flash. Already mentioned that
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Sorry I see that now. Does gas valve and burners shut down properly?

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HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Do you have a meter to see if the voltage is staying constant to the gas valve relay when it shuts down?

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Customer reply replied 2 years ago
I didn't see exactly how the guy had the volt meter hooked up.
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

What we do is put the meter is series. Disconnect the wire from flame sensor and connect it to one lead on meter.Put other meter lead on flame sensor where you unplugged wire.

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Customer reply replied 2 years ago
Meter didn't move. Flame shut off as soon as I disconnected meter.
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Are you sure meter was set on micro amps?

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Customer reply replied 2 years ago
DCA set on 250m. Not an electrician
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Hmm that is a bit strange,that we got no reading, but when you disconnected we lost signal to valve.Sounds like we were getting some signal through to board

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Customer reply replied 2 years ago
Did I lose you?
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

I am still here.Got called away from desk, Lets clean terminal on flame senser and reconnect.Maybe we had a bad connection.See if it will stay on and also check at board to make sue we have good connection

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Customer reply replied 2 years ago
It's clean connection clean and tight. Unit was serviced just a few months ago. Thought it was the flame sensor and just change it out myself. Then I ran into this website. I've since lost 180 in wages from work. I could have just started changing out parts. Or called a professional.
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

I understand. Sometimes it is less expensive just to call in a tech.If flame sensor is new , in flame good, wiring and connections good, I suspect failing board.

I would go ahead and replace board

http://www.amazon.com/ICM-Controls-Furnace-Control-Board/dp/B006M7E8QW

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