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JamesPa
@jamespa
Moderator
Illustrious Member
Joined: Apr 3, 2023
Last seen: Nov 12, 2025
Topics: 18 / Replies: 3340
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RE: Vaillant arotherm plus heat pump frost protection

@kentuk It occurs to me, have you got a timed heating schedule and if so what is it. Can you tell me why the indoor temperature was so low in the ...

9 months ago
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RE: Winter climatic curves v Spring/Autumn climatic curves

Very sensible (you, not your installer). I suggest (if you haven't already) you set any TRVs to well above the desired temperature and any thermost...

9 months ago
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RE: Vaillant arotherm plus heat pump frost protection

Im sorry but I really don't understand from what you have said how you are running your heat pump (for example how can WC work when the outdoor sensor...

9 months ago
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RE: Not a good January? My heat pump used 840 KWh of electricity

@roamingbull Whats the assessed heat loss of your house at what design temperature, and whats your house construction? Even estate newbuild is pretty...

9 months ago
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RE: Vaillant arotherm plus heat pump frost protection

OK. Im still not clear what is actually happening. Can you confirm, on 6/12/24 and 7/12/24 at those times, what were you expecting it to be do...

9 months ago
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RE: Vaillant arotherm plus heat pump frost protection

Sunday night was very cold where I am: - 2, I would definitely expect frost protection to kick in in this circumstance and be very worried if it didn'...

9 months ago
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RE: Vaillant arotherm plus heat pump frost protection

Ok. How do you know frost protection is triggering (as opposed to just normal operation)? With the outdoor sensor indoors how can WC work. I'm a ...

9 months ago
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RE: Vaillant arotherm plus heat pump frost protection

We might need to unpack this to work out whats happening. Here is an extract with the paper manual which came a couple of months ago with my unit (t...

9 months ago
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RE: Vaillant arotherm plus heat pump frost protection

Ok, just trying to clarify. So what you are experiencing if I understand you correctly is that when there is no call for heat and the outside temper...

9 months ago
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