@morgan, that’s awesome. Congratulations.

Regarding your issue, it may be that the ASHP controller isn’t taking direction from the Heatmiser. Do you only have one Heatmiser thermostat and do you have app control over it? We have the same units for our UFH - in the app, turn off your thermostat and see if that turns the heat pump off. 

If it doesn’t, I would suspect that the controller for the heat pump is not set to ‘external control’ (that’s the wording for our heat pump system, yours may be different) meaning that it’s taking commands from the Heatmiser.

In any event, would definitely call the installer.

Posted by: @derek-m

 

It would appear to be another fine example of installers not correctly commissioning a system before disappearing rapidly into the sunset.

Let me know what you find.

Bang on the money Derek. 

@editor 

I have no idea if it can be controlled via an app.  It wasn’t mentioned.

Posted by: @morgan

@editor 

I have no idea if it can be controlled via an app.  It wasn’t mentioned.

No problem. Just do it from the control panel. The first icon (the one next to hold) needs to be off. Apologies if you knew that already.

Give it five minutes and see if the pump turns off. If it continues to run with nothing calling for heat, I’d say it was a settings issue on the master (Mitsubishi) controller. Should be an easy fix for the installers. 

Also, is your Heatmiser hardwired back to the Mitsubishi controller or it wirlesless?

Posted by: @derek-m

@morgan 

Hi Morgan,

It is difficult to say for definite, not being there and able to interrogate the controller.

From the photo's it would appear that your controller is set to operate on the weather compensation curve, which if the parameters have not been set correctly may be causing a problem. Try changing the FTC6 controller from weather compensation curve control to either room temperature or flow temperature control as detailed on page 34 of the FTC6 manual.

Another possibility is that one or more of the DIP switch settings are incorrect, and the FTC6 controller does not know that the thermostat exists, or it is taking the wrong action. Try increasing the thermostat setting above the present room temperature and see if this stops the ASHP. Have a look at page 25 of the FTC6 manual for details.

It would appear to be another fine example of installers not correctly commissioning a system before disappearing rapidly into the sunset.

Let me know what you find.

@derek-m

Apart from the reference to the weather compensation setting (it is set for that) and your first sentence, I’ve not a clue thereafter 😂.

I think I will power the system down overnight and call the installer in the morning.

Posted by: @editor

Also, is your Heatmiser hardwired back to the Mitsubishi controller or it wirlesless?

If you’re referring to the last but one photo?  Wireless.  I have paired it again to be sure.

Posted by: @editor

Posted by: @morgan

@editor 

I have no idea if it can be controlled via an app.  It wasn’t mentioned.

No problem. Just do it from the control panel. The first icon (the one next to hold) needs to be off. Apologies if you knew that already.

Give it five minutes and see if the pump turns off. If it continues to run with nothing calling for heat, I’d say it was a settings issue on the master (Mitsubishi) controller. Should be an easy fix for the installers. 

It’s easy I know but I fail to understand.

I’m not at all tech savvy. I can use a computer but have no idea how to fix/set it etc.  Hence a lot of your questions and suggestions will draw a blank expression from me. I suspect I’m far from alone in that respect.  Hence please don’t for a moment take the ‘I don’t wish to teach you to suck eggs’.  I’m a dunce in this arena so please make any instructions explicit, concise and simple.  I get frustrated easily. You will not believe, for example, the trauma of being taught by my Dad how to tie my shoe laces or times tables. That isn’t a joke by the way. Please KISS in my case.

@heacol 

How do I know if the weather compensation curve is activated? Apologies if this is a daft question - no idea how to change the settings from the photo I posted to lower the bottom temperature!

I don’t think any of the thermostats work as it seems to irrelevant what they are set at! 

Plus, the radiators upstairs never get warm (never mind hot!) - I appreciate they won’t be hot like GCH radiators - but surely 

@morgan 

One easy thing that you can check is if the thermostat action has been reversed in the controller.

With your system running, increase the temperature setpoint on your thermostat up to say 30C and see if this switches off the ASHP. If you have more than one thermostat then increase the setpoint on all of them at the same time. If this has no effect then return all the thermostats to their original settings. If your ASHP does switch off when you adjust the thermostats, it is probable that DIP switch SW2-1 is incorrectly set, which your installer should be able to rectify.

If your installer cannot get out in the near future then let me know in the morning, and I may be able to talk you through various tests and adjustments that may resolve your problem.

Posted by: @derek-m

@morgan 

One easy thing that you can check is if the thermostat action has been reversed in the controller.

With your system running, increase the temperature setpoint on your thermostat up to say 30C and see if this switches off the ASHP. If you have more than one thermostat then increase the setpoint on all of them at the same time. If this has no effect then return all the thermostats to their original settings. If your ASHP does switch off when you adjust the thermostats, it is probable that DIP switch SW2-1 is incorrectly set, which your installer should be able to rectify.

If your installer cannot get out in the near future then let me know in the morning, and I may be able to talk you through various tests and adjustments that may resolve your problem.

@derek-m

Tried the process of turning the room stat up to 30c.  The flame symbol indicating a call for heat came on as expected but no change at the controller.

Due to the heating simply not turning off when the room stat stopped calling for heat having exceeded the set temp of 21c I powered off the entire system overnight.

This morning when I powered it back up it went through the system set up and then heated the DHW, the temp of which had dropped overnight. This is clearly as expected. The room stat was showing less than its programmed temp of 20c during the day and so was calling for heat (flame symbol showing). Once the DHW had reached its set 50c it switched over to CH.  Again as expected. I tried the operation suggested by Derek re 30c with no effect.  So I turned the room stat down to 14c.  Flame symbol gone but CH and ASHP still going.   Set the temp on room stat back to the programmed 20c and as the room temp has now exceeded 20c the pump should turn off.  It doesn't.  Basically the system is ignoring the room stat for some reason beyond my comprehension.  I shall have to contact the installer to get this sorted. 🤬 

Is it too much to ask for a system that simply works?

@morgan, no, it should work but it should be a simple fix.  

It sounds like there is some sort of pairing or connection issue between your remote thermostats and the central unit.  If you are on weather compensation, you could control the heating using that for the time being; just lower the graph on the ecodan controller a few degrees by pressing the down arrow until the big zero says -5 or so.  This will lower the target radiator temp by that amount and the ASHP should stop and come on again when the actual temp drops below the target.