Heat Pump fan not working when on heat


Old 03-04-15, 11:18 AM
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Heat Pump fan not working when on heat

Hi, all. I had a question about my heat pump if anyone has some advice.

I have a 10 year old RUDD heat pump. The heat pump fan on unit outside works when set to cool. However, when set to heat, it does not. I was under impression, from what I have read, that it should run in cold weather when it's not extremely cold.

So for example, today, when it's 65 outside, the fan does not turn on. The house does warm and I think it's due to auxiliary heat. When temp goes to around 40, the aux light turns on when heat kicks in (of course, heat pump fan doesn't run). When it's 50-60, heat kicks in, fan doesn't run, but no aux light turns on.

Anyone know if this is normal. I don't think it's normal.

In Jan, my heat bill was about 375. Month before it was 400 and it was extremely cold during these months. This has been the average from past years.
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Old 03-04-15, 11:40 AM
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Welcome to the forums.

Just to make sure I understand you...... the condensor fan works fine when the unit is in A/C mode but when set to heat..... it never runs or occasionally runs ?

It should usually run when in heat mode but it can stop when the system is in defrost. It is very possible that your defrost control board has a problem.
Old 03-04-15, 05:56 PM
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Does the heat pump compressor run without the fan?

If nothing at all runs outside , has the thermostat been replaced recently?

What is the model number of the heat pump?
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