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Old 04-11-2013, 06:16 PM   #1
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I have a Armstrong gas hot air furnace, model#guk075d14-2b. It runs for about 2minutes fine, shuts off for about 3 minutes, keeps cycling. Changed flame sensor, no help. Hoping circuit board is cure. Any input greatly appreciated. T.y.

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Old 04-11-2013, 06:50 PM   #2
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Dirty air filter/A/C coil/blower wheel/blocked or shut off registers.

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Old 04-11-2013, 09:38 PM   #3
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When you say it's shutting off, do you mean the entire furnace shuts off in that short of cycles?
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Old 04-11-2013, 10:08 PM   #4
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Is it the main flame that goes off every 2 minutes? The inducer motor?
The blower motor?
Do you have a led diagnostic light that's flashing?
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Old 04-11-2013, 10:14 PM   #5
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yes, the blower fan shuts off before the system reaches thermostat setting. system starts up again as if it was just turned up higher temp after sitting off for about 3 minutes. burner comes on ,then fan, 2minutes shuts down. does this until reaches desired temp. clean filter and no blocked registers.
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Old 04-11-2013, 10:18 PM   #6
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System has no diagnostic led light. circuit board may have gotten wet in the past.
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Old 04-11-2013, 10:32 PM   #7
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Hmmm....Water and boards just don't mix.

I'd first confirm that it's not a stat problem by bypassing it at the furnace board.
Turn off furnace power.
Remove the stat wires from R & W where they attach to the furnace board.
Attach a small piece of insulated wire between R & W.
Turn power back on.
If the furnace stays on..it's a stat problem.
If it keeps short cycling like before, reverse what you did with the stat wires and it's on to the next step.
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Old 04-11-2013, 10:44 PM   #8
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Sorry, but i'm a rookie, whats R&W ? thanks alot
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Old 04-11-2013, 10:51 PM   #9
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If you follow your thermostat wires into the furnace, they will eventually attach to a series of low voltage screws on the furnace board. Those screws positions will be marked with letters.(including R & W) Your thermostat just completes the circuit between those two to run the furnace.
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Old 04-11-2013, 10:56 PM   #10
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Thanks HOW, i will try that tomorrow.hagn I will post results .

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