Natural gas furnace stuck on defrost, 2nd stage and won't heat.

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  #1  
Old 12-27-14, 03:27 PM
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Natural gas furnace stuck on defrost, 2nd stage and won't heat.

Greetings,

I have a bi-energy heating system, Lincoln natural gaz furnace and a Kenmore (ICP, Model CHP224AKA1) heatpump controlled by a Sears thermostat.

During this time of the year, I set the thermostat on "emergency heat", which bypasses the heat pump and runs on furnace exclusively. My furnace started misbehaving a couple weeks ago, when I woke up to a cold house. It seems the furnace got stuck on 'defrost mode'. After turning the thermostat on/off a couple times, it started heating again like normal. It happened a couple other times and then it now it just won't start heating at all, on emergency heat or not. When on emergency heat, the 'aux' light comes on, and I hear a 'tick' sound, but the word 'heat' doesn't come up on the thermostat.

The furnace control panel shows no blinking light on start. The 'defrost', '2nd stage', and 'power' indicators are lit. I've tried bypassing the thermostat by wiring the R and W2 wires together, with same results. The furnace pilot glows a bright orange, but nothing happens. I'm pretty sure it shouldn't even try to defrost when on 'emergency mode'.

Any ideas of what I could look for?

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  #2  
Old 12-27-14, 04:34 PM
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You are right, when in emergency mode the heat pump won't run or defrost. Have you checked the power to the gas valve?
 
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Old 12-30-14, 11:06 AM
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I tested power to the valve, it's around 26-28 VAC. The controls are also powered. There's a plastic cover that I removed to see if there was anything I could fix in the valve, but I'm not seeing anything abnormal there.

Faulty valve?

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Old 12-30-14, 03:38 PM
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Problem was with the ignition. After changing it, I got a pilot flame, which I didn't have before, but the heat still wouldn't start, the flame was yellow and not stable. After cleaning, the tiny ignition hole, furnace finally started.
 
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Old 12-30-14, 06:06 PM
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Glad you got it up & running. As a side note, in your first picture of the thermostat, I don't like the looks of the wires as they come out of the wall. Maybe it's just dust or due to a lack of light but they look awfully dark as if they've been hot. Probably nothing but worth taking a look.
 
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