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Joined: Jan 20, 2022
Last seen: Sep 18, 2025
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Topics: 16 / Replies: 2463
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RE: Numerous issues – 11kW Daikin Altherma 3

If "it" was going wrong at 23:30 then you should be able to see the electricity usage on data collected by your Energy Supplier sometime after midnigh...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Numerous issues – 11kW Daikin Altherma 3

I'm not the best person to answer that @newhouse87 I'm not a heat pump specialist.I work with embedded controllers, sensors, feedback systems and th...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Numerous issues – 11kW Daikin Altherma 3

Given that Daikin are an international company, I think the LCD display isn't using British nomenclature. I think the 3-way valve reference to SHC i...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Numerous issues – 11kW Daikin Altherma 3

Like any other domestic 'frost-stat', the BUH temperature system is there to protect your pipes from freezing. It has no concept of whether 'heat is...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Numerous issues – 11kW Daikin Altherma 3

I don't expect they'll use more than 1 temp sensor on the outside unit. Look at your graph.There are three areas of interest The red sector is c...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Numerous issues – 11kW Daikin Altherma 3

Well I'm guessing that the temp sensor is positioned where it has access to the surrounding air, but isn't within the air-stream which gets drawn thro...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Jokes and fun posts about heat pumps and renewables

This joke's on me. It's often the case that I use a 3D printer to create a few components needed for an 'energy project'. These can sometimes take...

2 years ago
Forum
Well & Truly Off The Grid
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RE: Numerous issues – 11kW Daikin Altherma 3

The actual outside temperature might not be below freezing...... but the heat-pump controller thinks it is.That's what triggers the BUH. Why not jus...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Numerous issues – 11kW Daikin Altherma 3

Disabling a feature could just be masking a poor solder joint in a connection to a sensor! Wouldn't it be better to narrow down the search first bef...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Numerous issues – 11kW Daikin Altherma 3

Whatever we're looking for is an intermittent fault.It occurs, and then goes away. If you look at the display a few hours later, everything might ap...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Numerous issues – 11kW Daikin Altherma 3

It doesn't matter what the manual states about the BUH operating only rarely.That's just declaring what it's meant to do.But we're looking at a fault ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Numerous issues – 11kW Daikin Altherma 3

Do you have any record of the DHW tank temperature during these night-time antics? 240-litres looks like a great place to dump a shed-load of energy...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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