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Air Source Heat Pumps (ASHPs)

Last Post by bontwoody 3 weeks ago

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bontwoody

(@bontwoody)

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Topic starter 26/09/2025 6:01 pm

I think I may have done something silly, but havent been able to figure out what so some help would be appreciated.

Last heating season, I had my Samsung working very nicely with water law and scheduling. This season I believe it started as before but I think I used the up and down arrows on the controller to adjust the room temperature and now the scheduling doesnt seem to work. I dont recall changing anything else.

Try as I might I cant get it to revert to its previous operation mode.

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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Old_Scientist

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27/09/2025 1:32 pm

Sorry, not sure I can help. I only use Daily schedules which only apply to DHW. We use a programmable third party room thermostat to control heating ON/OFF by a timed schedule.

I do have a digital copy of the manual somewhere though. Do you have a copy of the user manual to check?

When I enter schedule on my controller, the Weekly and Yearly options are greyed out, but that maybe because I already have daily schedules for DHW set up (I'm not sure you can use both at the same time).

Samsung 12kW gen6 ASHP with 50L volumiser and all new large radiators. 7.2kWp solar (south facing), Tesla PW3 (13.5kW)
Solar generation completely offsets ASHP usage annually. We no longer burn ~1600L of kerosene annually.

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bontwoody

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Topic starter 27/09/2025 3:55 pm

@old_scientist thanks for trying. I do have a copy of the user manual but it's not helping. 😁

I only use the weekly schedules as I dont heat my hot water with the ASHP

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Old_Scientist

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27/09/2025 11:07 pm

Your schedules look like they are greyed out?

The only thing I could find is that weekly schedules for heating are not available (greyed out) if a 3rd party room thermostat is in use (FSV #2091 #2092), so maybe check these settings. It looks from your first picture that a 3rd party room thermostat isn't in use as the heating side of the display shows a set temperature in degC (21.5C).

Is the system just ignoring your schedules and providing heat 24h per day rather than turning off at 22:00?

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bontwoody

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Topic starter 27/09/2025 11:15 pm

@old_scientist Thanks. I'll check the FSVs tomorrow. Yes it's just on 24/7 now so it's not a disaster but I'd like to get to the bottom of it.

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bontwoody

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Topic starter 28/09/2025 10:18 am

@old_scientist Just checked the FSV's both are set to NOT USE. I think I will delete all my schedules and then try re instating them to see if that makes a difference. 🙁

👍

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Old_Scientist

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28/09/2025 11:31 am

Posted by: @bontwoody

↑

@old_scientist Just checked the FSV's both are set to NOT USE. I think I will delete all my schedules and then try re instating them to see if that makes a difference. 🙁

OK, as expected, so not that (but was worth checking).

I'm puzzled why they appear to be greyed out. Were they always greyed out like that? The fact they are greyed out indicates to me that they are not active (as you've observed), but we don't (yet) know why.

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bontwoody

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Topic starter 28/09/2025 12:58 pm

@old_scientist My feeling was that they might always have been greyed out but I wouldn't bet any money on it. I've reinstated new schedules now and will see if that makes any difference 🙂

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Old_Scientist

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28/09/2025 7:41 pm

Posted by: @bontwoody

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@old_scientist My feeling was that they might always have been greyed out but I wouldn't bet any money on it. I've reinstated new schedules now and will see if that makes any difference 🙂

@bontwoody are the new schedules you've added also greyed out?

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bontwoody

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Topic starter 28/09/2025 7:58 pm

@old_scientist Yes they are. Ive found a detailed discussion of the relevant FSV numbers on OEM. They suggest 2091 - Not Use, 2092 - Not Use and 2093 - Room Temp and WL Water Pump 3.

Ive checked and that is how mine is set up, so no nearer finding out what is going on 🙁

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TechnoGeek

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30/09/2025 11:32 am

@bontwoody have you checked you have not set any holiday modes (Sunday to Saturday set on) on accidentally? If I switch holiday modes on on my Samsung Gen 6 it does grey out all my weekly, yearly schedules.

This post was modified 3 weeks ago by TechnoGeek

5 Bedroom House in Cambridgeshire, double glazing, 300mm loft insulation and cavity wall insulation
Design temperature 21C @ OAT -2C = 10.2Kw heat loss
Bivalent system containing:
12Kw Samsung High Temperature Quiet (Gen 6) heat pump
26Kw Grant Blue Flame Oil Boiler
All controlled with Honeywell Home smart thermostat

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bontwoody

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Topic starter 30/09/2025 12:38 pm

@technogeek You are a star! I must have set holiday modes when I was trying different ways of turning it off for the summer. Thanks everyone for helping 😁