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Gary
@gary
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Joined: Feb 8, 2023
Last seen: May 23, 2025
Profile Activity
Topics: 2 / Replies: 346
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RE: Mitsubishi Ecodan stuck on immersion symbol

Ideally you want it all to come on at the same time. When my hall thermostat calls for heat all of the UFH loops downstairs come on and all the rads ...

5 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan stuck on immersion symbol

Yep that all makes sense the easiest solution is to remove all the actuators from the UFH manifold they should just unscrew them all loops will be ope...

5 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan stuck on immersion symbol

So presumably the EPH thermostats are wired back to a controller near to the UFH manifold? Do you have a picture of that?

5 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan stuck on immersion symbol

That will be the cause then, with only 1 thermostat calling for heat the water volume is too small it heats quickly and the heat pump has to turn off ...

5 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan stuck on immersion symbol

That’s definitely cycling do you have UFH or rads regardless of which it would suggest you have only a very small proportion of the heating system cal...

5 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan stuck on immersion symbol

They could be defrosts but unlikely at that Frequency. do you have the MELCloud app that can show the flow and retune temps for those times? There...

5 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Analysing MELcloud heat pump graphs

It’s an 8.5kw ecodan UFH and rads. WC set at 32C at 3C, 45C at -10C. Running on weather comp with thermostat set to 22C in the hallway. Once it g...

5 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan stuck on immersion symbol

@ak2024 that is the HP cycling on and off 2/3 times an hour usually happens at milder outside temps when the flow temp is around 30C or less. I have ...

5 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Analysing MELcloud heat pump graphs

@boycey what you have there is really bad cycling 10 times an hour. if you increased the flow rate this will have only worsened it as it has less ti...

5 months ago
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Air Source Heat Pumps (ASHPs)
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RE: The Definitive Guide to Weather Compensation and Curves for Air Source Heat Pumps

@boycey in milder temps you have to limit heating with the thermostats so that’s set at 22C to turn the heat pump off till it cools back down again.

5 months ago
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Air Source Heat Pumps (ASHPs)
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RE: The Definitive Guide to Weather Compensation and Curves for Air Source Heat Pumps

5 months ago
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Air Source Heat Pumps (ASHPs)
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RE: The Definitive Guide to Weather Compensation and Curves for Air Source Heat Pumps

The Ecodan WC curve doesn’t have presets like you see in other systems it’s fully customisable. So you can set the high and low end at any OAT and ch...

5 months ago
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Air Source Heat Pumps (ASHPs)
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