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MELcloud scheduling misbehaviour

 
Air Source Heat Pumps (ASHPs)
Last Post by Abernyte 33 minutes ago
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downfield
 downfield
(@downfield)
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Joined: 1 year ago
Posts: 103
Topic starter 02/12/2025 4:31 pm  

I am aware that there are other threads discussing the shortcomings/confusion caused by the ability to set time schedules on both the Ecodan FTC wall box and the MELcloud app, but I think this warrants a separate thread.

I use MELcloud to set the following winter time schedule, viz:  

0500 - 2200:  21C  

2200 - 0500:  17C.

Pretty simple you would think.  About 98% of the time it works fine.  But seemingly at random it fails either to set back the temperatiure in the evening or to advance it in the early morning.

About 5 days ago we realised the house was too warm and it had stayed at 21C all night.  This morning I woke at 0700 and realised the house was cold - still set at 17C.

Has anyone else seen this behaviour?  For the avoidance of doubt, I never use the FTC wallbox to control the schedule, but I do wonder if a setting there is interfering with the MELcloud schedule in some way.

 

 

 

 

 


Mitsubishi Zubadan 14kW with Mixergy 210l DHW in 220m2 barn property. 24 solar panels = 9kWp with GivEnergy 5.0kW Hybrid inverter and 19kWh GivE batteries. Jaga Strada fan-assisted rads throughout. Landvac vacuum glazing/triple glazed windows.


   
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Abernyte
 Abernyte
(@abernyte)
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Joined: 3 years ago
Posts: 247
02/12/2025 4:58 pm  

I too use MELcloud exclusively to schedule temp changes and over night set back.  Yes,  very occasionally it misses a beat and the times that I have been able to pin it down were mini and intermittent internet connection drops. I put that down to the quality of the wet string that Openreach use to get what they laughingly call an internet service to the back of beyond. It is equally possible the failure may on occasion be the signal from Mitsubishi.  It has never been too much of an issue to follow up. 



   
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