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SUNandAIR
SUNandAIR
@sunandair
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Noble Member
Joined: Dec 30, 2022
Last seen: Jul 9, 2025
Profile Activity
Topics: 5 / Replies: 495
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RE: Ecodan UD 0-0 error

Hi Gary, haven’t seen full numbers on your error code but UD appears to be an overheat protection code. You could also do an Info request… like the...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

@heatgeek I kind of get it… but aren’t you still in the same situation of having excess flow temp water at the bypass entering the buffer at circa 23 ...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

This is very impressive. I would not have expected the cop to increase to the extent of your graph as the ambient readings had dropped between esp bet...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: ASHP Ecodan L9 error - No Heating but Hot Water

@phoenix15 I hope you have success with finding a Mitsubishi accredited engineer very soon. Esp. If you have a leak as well. it may be that over tim...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Help with understanding my Mitsubishi Ecodan air source heat pump

@patch I think @ashp-bobba gave you some great pointers about low temperature operation. While it is more efficient to operate at lower flow temperatu...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Help with understanding my Mitsubishi Ecodan air source heat pump

Not quite Right Morgan… the freeze stat function monitors system internal water temperature and activates the circulation pump to ensure the outside w...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: ASHP Ecodan L9 error - No Heating but Hot Water

That’s interesting, but obviously concerning also…. Do you know how to access the flow rate enquiry menu on your main controller? IE the screen enquir...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: ASHP Ecodan L9 error - No Heating but Hot Water

@phoenix15 just wondering did you eventually find the other filter. Many of the Mitsubishi installs don’t always use the Y strainer. Instead thy have ...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Ecodan - is there actually such a thing as a 'minimum' flow temp to avoid cycling, and why if so?

Logically, the lower frequency = more gentle, yes, but isn't the main wear/damaging issue here the stopping then restarting, and possibly the 'burst' ...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Ecodan - is there actually such a thing as a 'minimum' flow temp to avoid cycling, and why if so?

@rhh2348 it’s clear you are wanting to run your heat pump at a low flow rate ie 30c. But you are also aware of some of the limitations of operating at...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Ecodan - is there actually such a thing as a 'minimum' flow temp to avoid cycling, and why if so?

So James I’m sure you might realis that my first 2 points were giveaway comments - ones that you couldn’t really object to. So your agreement is some...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Performance of Heat Pumps in Mild Weather

@trebor12345 it should be possible to work out the (nominal) input from the data provided since it has COP and output data. The chart would suggest ...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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