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Air Source Heat Pumps (ASHPs)
Last Post by SUNandAIR 12 months ago
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Toodles
 Toodles
(@toodles)
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25/10/2024 4:07 pm  

@richard24738 How about a slightly taller and evergreen plant in a pot where the present one is? 😉 Toodles.


Toodles, heats his home with cold draughts and cooks food with magnets.


   
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 Richard24738
(@richard24738)
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Joined: 2 years ago
Posts: 99
Topic starter 25/10/2024 4:28 pm  

@toodles I guess you are trying to create a bit of shade.

Not sure if the wife will agree to blocking the kitchen window and to be honest, unless it's quite far out from the wall, it wont create any shade.

Mitsi have just telephoned and will visit on the 1st November.


Install 13 April 2024 - 4 Bedroom Brick Detached - Heat Loss 9,281w, Design 45c at -2 - Ecodan 11.2kw R32 - 25L Buffer - 250L Telford Tempest HP DHW - All 16 radiators replaced - Auto Adapt - Mel-Pump app - Octopus Cosy Fixed
19 Jan 2026 - 1 x Sigenstor 10 battery and 8kw Inverter


   
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Toodles
 Toodles
(@toodles)
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25/10/2024 4:44 pm  

@richard24738 Sounds like a plan then! Toodles.


Toodles, heats his home with cold draughts and cooks food with magnets.


   
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 Boycey
(@boycey)
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Posts: 41
08/01/2025 9:53 pm  

@richard24738 what did mitsu say in the end, did you manage to fix the issue?



   
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 Richard24738
(@richard24738)
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Joined: 2 years ago
Posts: 99
Topic starter 08/01/2025 10:04 pm  

@boycey

Legionairres taking too long: Mitsubishi diagnosed a defective immersion heater. Installer is coming next week to replace it.

Outside temperature over reading: Mitsubishi replaced the outside thermostat under warranty. I have doubts if that will fix the over reading but can't really tell until we get some warmer sunny weather.


Install 13 April 2024 - 4 Bedroom Brick Detached - Heat Loss 9,281w, Design 45c at -2 - Ecodan 11.2kw R32 - 25L Buffer - 250L Telford Tempest HP DHW - All 16 radiators replaced - Auto Adapt - Mel-Pump app - Octopus Cosy Fixed
19 Jan 2026 - 1 x Sigenstor 10 battery and 8kw Inverter


   
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 Boycey
(@boycey)
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Joined: 1 year ago
Posts: 41
09/01/2025 7:42 am  

@richard24738 do you know where the outdoor thermistor sits, is it on the back, top corner? Mine sits on a raised balcony but south facing, I'm thinking maybe I could move it to sit just under the raised slabs, probably a less affected area by sunny days.



   
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 Richard24738
(@richard24738)
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Joined: 2 years ago
Posts: 99
Topic starter 09/01/2025 9:01 am  

@boycey Yes, the thermostat on my Ecodan is on the back in the top corner.

When the engineer replaced the thermostat, I suggested that it could perhaps be repositioned so as not to be affected by heat radiating off the house wall.

He poo poo'd the suggestion saying that all ecodans have it on the back at the top without a problem. We shall see!

Shame it's wired and not wireless.


Install 13 April 2024 - 4 Bedroom Brick Detached - Heat Loss 9,281w, Design 45c at -2 - Ecodan 11.2kw R32 - 25L Buffer - 250L Telford Tempest HP DHW - All 16 radiators replaced - Auto Adapt - Mel-Pump app - Octopus Cosy Fixed
19 Jan 2026 - 1 x Sigenstor 10 battery and 8kw Inverter


   
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 Richard24738
(@richard24738)
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Joined: 2 years ago
Posts: 99
Topic starter 18/03/2025 3:11 pm  

Just to follow up on the Outside temperature issue.

Last year I reported that the Ecodan outside temperature was over reading on sunny days. An engineer visited and replaced the thermostat. I hadn't noticed a problem since but that has been during the winter.

Today is a lovely sunny day - actual outside temperature 12c - Ecodan Outside temperature reading 22c!

Phoned Mitsubishi and asked if I should be concerned and the answer was yes due to the reading affecting Auto Adapt.

I explained that I hadn't noticed anything during the winter but now with a sunny day, the outdoor temperature reading has shot up.

As my original report of this last year was a warranty issue they want to check the system out again under warranty.

Personally I believe the problem is simply caused by the positioning of the thermostat so it catched the sun from the side and has reflected heat from the wall behind.

Repositioning the thermostat would seem to be the obvious solution but the original Mitsubishi Engineer said no.


Install 13 April 2024 - 4 Bedroom Brick Detached - Heat Loss 9,281w, Design 45c at -2 - Ecodan 11.2kw R32 - 25L Buffer - 250L Telford Tempest HP DHW - All 16 radiators replaced - Auto Adapt - Mel-Pump app - Octopus Cosy Fixed
19 Jan 2026 - 1 x Sigenstor 10 battery and 8kw Inverter


   
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JamesPa
 JamesPa
(@jamespa)
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18/03/2025 3:20 pm  

Posted by: @richard24738
↑

Personally I believe the problem is simply caused by the positioning of the thermostat so it catched the sun from the side and has reflected heat from the wall behind.

Repositioning the thermostat would seem to be the obvious solution but the original Mitsubishi Engineer said no.

Weird that the Mitsubishi engineer says no.  My (vaillant) sensor was specifically placed by my installer somewhere in permanent shade, with no chance of reflected sunlight.

 

Perhaps you could try rigging up a temporary shade and observe what happens to the output figure!


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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 Richard24738
(@richard24738)
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Joined: 2 years ago
Posts: 99
Topic starter 18/03/2025 4:39 pm  

@jamespa Unfortunately it's now in the shade.

The outside temperature is now down to reading a more realistic 11c so I'll have to wait for another sunny day!

Big drop of 11c from in the sun to shade.


Install 13 April 2024 - 4 Bedroom Brick Detached - Heat Loss 9,281w, Design 45c at -2 - Ecodan 11.2kw R32 - 25L Buffer - 250L Telford Tempest HP DHW - All 16 radiators replaced - Auto Adapt - Mel-Pump app - Octopus Cosy Fixed
19 Jan 2026 - 1 x Sigenstor 10 battery and 8kw Inverter


   
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JamesPa
 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 3 years ago
Posts: 4390
18/03/2025 4:48 pm  

Posted by: @richard24738
↑

@jamespa Unfortunately it's now in the shade.

The outside temperature is now down to reading a more realistic 11c so I'll have to wait for another sunny day!

Big drop of 11c from in the sun to shade.

... but suspicious it correlates with it getting shaded.  11C isnt particularly surprising.  Hopefully its white in colour, if it were black it could easily be double or treble!


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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 Richard24738
(@richard24738)
Estimable Member Member
Joined: 2 years ago
Posts: 99
Topic starter 18/03/2025 4:52 pm  

James: Just noticed the timing of the drop: from 21 c at 16:05 to 10c at 16:45.


Install 13 April 2024 - 4 Bedroom Brick Detached - Heat Loss 9,281w, Design 45c at -2 - Ecodan 11.2kw R32 - 25L Buffer - 250L Telford Tempest HP DHW - All 16 radiators replaced - Auto Adapt - Mel-Pump app - Octopus Cosy Fixed
19 Jan 2026 - 1 x Sigenstor 10 battery and 8kw Inverter


   
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