Mitsu Wireless Controller and MelCloud

DavidAlgarve · 2025-08-12T15:43:45Z

I have just had a PAR-WT60R Wireless controller fitted to an Ecodan Hydrobox and I would like to compare notes with someone who has a similar setup. Firstly, the heating is switched off until 1st October, but MelCloud is showing "House Heating" as "Idle", whereas previous to the installation I think it stated "Stopped" or similar. Surely, it should only show "Idle" when in operating mode and having reached temperature? (DHW is also showing "Idle" outside the timed operating period and I thought this also, previously showed "Stopped" only outside a timed period). Secondly, the MelCloud "House heating" is currently showing "Room temperature" as 32C whereas the Wireless controller is showing a room temperature as 26C. I suspect the 32C temperature is being picked up from the thermocouple in the Hydrobox FTC6 which is located in an outside Pump Room. I seem to recall that I can change over the selected thermouple in the FTC6 menu, and would appreciate comments. I haven't got round to looking at the menu yet, mainly because our outside temperature is currently 41C!

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Air Source Heat Pumps (ASHPs)

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DavidAlgarve

(@davidalgarve)

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Topic starter 26/08/2025 4:56 pm

@robs Hi Rob,

At the end of a note to Mitsu UK, thanking them for clearing up my question about any link between scheduling on MelCloud and the FT6, I slipped in a question about the sensor setting and I have received the following reply:

"With our thermostat installed it will come up with a new option of Room RC 1 through 8
You set the sensor setting to which ever number the thermostat was set to"

So I will be interested to see which number comes up on the remote. Logically you would expect that with one room remote, it will come up with RC1, but we will see!

342sq m "Upside down" house in Algarve. Portugal
Mitsubishi PUHZ-120YUK 16kW ASHP
12 Solar Panels Growatt Inverter
2 x Growatt 7.5kW Batteries
Fronius EV Charger
Kia e- Niro 64kW

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