Furnace and Heat Pump Failures in Cold Weather: Troubleshooting a 2021 3121RL

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Member Title: Heat trouble
A member experienced simultaneous failures of both the furnace and rear A/C heat pump in their 2021 3121RL with iNCommand during cold weather, leaving only electric heaters as backup. The furnace would run the fan and open the gas valve but failed to ignite, despite replacing the igniter and confirming other components were functional. The rear A/C heat pump also stopped responding to iNCommand controls. Community members suggested a hard reset of the iNCommand system, checking the igniter...
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When you take down your basement wall, you will find a heater duct laying on the floor back there. Take this duct and route it down the hole where your plumbing goes to the holding tanks. Point it down and aft as far as you can. This will put heat into your underbelly towards your dump valves to help prevent freezing valves, tanks and plumbing.
Take Gorilla tape and seal up any holes around your frame. This will stop Drafts and help keep you warmer.
None of mine were just laying. I took the time to make sure they were connected securely. I do get heat out of the vent in the storage bay.
 
This was the culprit. It was rustier when we removed it. This is after a clean up attempt.
 

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Yep, I've seen that before. If it happened once...guess what. Buy another one and keep it with you for the next time. You can reduce down time when it matters.
 
I had my furnace start up and then not fire. I replaced the auto resetting fuse with standard fuse and this corrected the issue. The fuse would trip and then reset during troubling shooting. Stand fuse holds longer to allow the inrush current to lower long enough.
 

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