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Siting of the external sensor on a heatpump

 
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Air Source Heat Pumps (ASHPs)
Last Post by Batpred 4 weeks ago
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bobflux
 bobflux
(@bobflux)
Reputable Member Member
Joined: 8 months ago
Posts: 187
13/09/2026 10:20 am  

My heat pump receives sunlight, so when the fan is not blowing, OAT sensor readings are hotter than actual air temp.



   
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Toodles
 Toodles
(@toodles)
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Joined: 4 years ago
Posts: 2995
13/09/2026 4:18 pm  

@jamespa Installation of gas boilers would be carried out by registered gas fitters so it would be unlikely that many consumers would question the workmanship; muppets would be able to get away with it rather than the consumer doubting the muppet’s ability. With heat pumps, I would suggest that the consumer is likely to be more enlightened and also more questioning so muppets might be detected more readily. Regards, Toodles.


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


   
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Toodles
 Toodles
(@toodles)
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13/09/2026 4:35 pm  

@bobflux My Daikin ASHP is SSW facing and the wall behind it has cavity wall insulation; during the summer, this produced ASHP temp readings of 35 - 40 C.! I think that even in wintertime, if the sun shines for a few hours, the reading is elevated by a few degrees C. Regards, Toodles.


This post was modified 4 weeks ago by Toodles

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


   
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Jancold
 Jancold
(@jancold)
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Joined: 4 years ago
Posts: 186
13/09/2026 6:45 pm  

My Octopus electrician (part of the installer team) noted that even in April there was some sun getting through to the  Daikin and asked to site the sensor on a wall in the shade. Since the way to that was under a path he did ask for a conduit which I was happy to provide. 


Daikin 6Kw ASHP.
MG4 EV, Solis 8KW inverter, 32KWh battery
1926 Semi with loft and wall cavity insulation, all radiator.


   
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Batpred
 Batpred
(@batpred)
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Joined: 2 years ago
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Topic starter 13/09/2026 8:26 pm  

Posted by: @toodles
↑

muppets would be able to get away with it rather than the consumer doubting the muppet’s ability. 

Our boiler came with the house.. We found all sorts of issues (like the internal thermostat was in the boiler cabinet!!) and when we tried to reach the muppet, he had moved to the next county. The gas side was probably safe, but everything else was shortcut. 

 


8kW Solis S6-EH1P8K-L-PLUS hybrid inverter; G99: 8kW export; 16kWh Seplos Fogstar battery; Ohme Home Pro EV charger; Vaillant Arotherm Pro 7kW; 100Amp head, HA lab on mini PC


   
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JamesPa
 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 4 years ago
Posts: 5510
13/09/2026 9:09 pm  

Posted by: @batpred
↑

Posted by: @toodles
↑

muppets would be able to get away with it rather than the consumer doubting the muppet’s ability. 

Our boiler came with the house.. We found all sorts of issues (like the internal thermostat was in the boiler cabinet!!) and when we tried to reach the muppet, he had moved to the next county. The gas side was probably safe, but everything else was shortcut. 

 

Of course had the heat source been a heat pump it would all have been the fault of the heat pump not the muppet who installed it, but just as we dont talk about muppets installing boilers, we dont talk about the faults they leave nor assign them to 'the boiler'.

That doesn't excuse these faults of course, but it does put them in context by confirming that muppets work on boilers and leave problems behind just as they work on heat pumps and leave problems behind.  In neither case is the technology at fault, the fault lies with the muppets. 


This post was modified 4 weeks 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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Batpred
 Batpred
(@batpred)
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Joined: 2 years ago
Posts: 1185
Topic starter 14/09/2026 4:25 pm  

@jamespa

Absolutely. Even if the same mistake was made with the boiler, this is no excuse for the heatpump installer. I just told them that I do not consider it urgent and that I do not care whether they shield it or move it. 


8kW Solis S6-EH1P8K-L-PLUS hybrid inverter; G99: 8kW export; 16kWh Seplos Fogstar battery; Ohme Home Pro EV charger; Vaillant Arotherm Pro 7kW; 100Amp head, HA lab on mini PC


   
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