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Air Source Heat Pumps (ASHPs)

Last Post by bontwoody 4 months ago

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Profzarkov

(@profzarkov)

Estimable Member Member

Joined: 1 year ago

Posts: 53

Topic starter 05/09/2025 9:14 am

I've just had my ASHP serviced - quite tricky out here in West Wales. The installers CES didn't want to know and aren't taking on any new customers - I guess they're victims of their own success - too many installs!

Anyway, Green Warmth came out and did a very good service.

However, the next day, and probably or not totally sure it was their fault - the ASHP is now playing up.

The CH pump is ON continuously. If I boost the HW and cause the heat pump to operate, it stops the CH pump.

But as soon as the HW reaches the target it goes back to running non stop.

I had a go at firing up the thermostats to run the CH but nothing changed - pump runs but it does not fire up the ASHP.

I know I've had the CH off all Summer but we have kept the HW going.

I've got one of their engineers coming out this afternoon - if it's not their fault, it's going to cost but I'd like to get it sorted before the winter. Last year it was brilliant - greatly reduced costs and a warm house. I'm a physicist and have a good idea of how it all works - I set up the "WaterLaw" and as I say, it all worked a treat. I'm very frustrated that I can't work out what it's doing . . . .grr.

Any ideas?

Steve

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JamesPa

(@jamespa)

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Joined: 3 years ago

Posts: 3919

05/09/2025 10:08 am

When I had my previous gas boiler serviced it was quite common for the serviceman to 'reset' some of the settings, in particular the flow temperature. Hopefully its not that but it might just be worth checking.

4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.

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Profzarkov

(@profzarkov)

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Topic starter 05/09/2025 10:15 am

@jamespa flow temp 🤔 how do I check that?

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JamesPa

(@jamespa)

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05/09/2025 10:20 am

Posted by: @profzarkov

↑

@jamespa flow temp 🤔 how do I check that?

Water law settings would be the first place to look. To be honest I really wouldn't expect a serviceman to reset such things, but then neither would I have expected a gas boiler serviceman to do so!

Is it heating or is it just that the water pump is running?

This post was modified 4 months ago by JamesPa

4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.

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Profzarkov

(@profzarkov)

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Topic starter 05/09/2025 10:24 am

@jamespa it's a bit odd. The CH pump is running. All the time. I tried to run the CH by switching on both the two zone thermostats but nothing happened apart from the pump carrying on running. The HW side still works OK and even more oddly, when that side is running it shuts down the CH pump whilst its heating up. Maybe a valve stuck think??

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bontwoody

(@bontwoody)

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Joined: 4 years ago

Posts: 969

05/09/2025 10:47 am

There is s test mode in the Samsung menu where you can turn the pump on and off manually. Could it be they left that on?

House-2 bed partial stone bungalow, 5kW Samsung Gen 6 ASHP (Self install)
6.9 kWp of PV
5kWh DC coupled battery
Blog: https://thegreeningofrosecottage.weebly.com/
Heatpump Stats: http://heatpumpmonitor.org/system/view?id=60

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JamesPa

(@jamespa)

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05/09/2025 10:50 am

Posted by: @profzarkov

↑

@jamespa it's a bit odd. The CH pump is running. All the time. I tried to run the CH by switching on both the two zone thermostats but nothing happened apart from the pump carrying on running. The HW side still works OK and even more oddly, when that side is running it shuts down the CH pump whilst its heating up. Maybe a valve stuck think??

Have you got more than one pump or only one? If more than one which one is running? Have you got a buffer? What happens if you turn the zone thermostats down to minimum? This might not be the heat pump! Try also @bontwoody s suggestion.

4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.

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Profzarkov

(@profzarkov)

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Topic starter 05/09/2025 11:20 am

Yes, two pumps - one for running the heat pump and the other for the CH. Thermostats are off!

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Profzarkov

(@profzarkov)

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Topic starter 05/09/2025 11:26 am

Maybe a complete reset? I think I'll leave it until the guy gets here this afternoon.

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Profzarkov

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Topic starter 05/09/2025 11:26 am

@bontwoody no, there;s nothing left on - all options are OFF.

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JamesPa

(@jamespa)

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05/09/2025 11:29 am

Posted by: @profzarkov

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Yes, two pumps - one for running the heat pump and the other for the CH. Thermostats are off!

so which pump is running and is anything heating?

This post was modified 4 months ago by JamesPa

4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.

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Profzarkov

(@profzarkov)

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Joined: 1 year ago

Posts: 53

Topic starter 05/09/2025 11:38 am

@jamespa just the CH one and no nothing is heating. When I put the demand in for hotter water - it shut down the CH pump plus some whirring of valves - not sure which. But as soon as the HW demand was met, it went back to the continuous running. It was odd that I couldn't run the CH system. Maybe too warm outside? We'll see

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