Posted by: @mikeh

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Yeah the problem is that they couldn't even do a cursory check because they couldn't force the system to heat up. I feel a bit better knowing that they weren't feeding me a BS line about the system automatically kicking in when the outside temperature drops. At least I know now that the the system will heat up now. my assumption is that they will have to come back to sync the new thermostat when ever that is ready and at that point they will balance the rads. Just need to get that confirmed now. 

Is the missing device a thermostat or a temperature sensor?

@johnmo I would have thought you would have the ability to set your preference for temperature - even if you don’t need a schedule if you are running the heating 24/7/365? Inquisitively, Toodles.

@derek-m the missing device is a wireless thermostat. There is no internal temperature sensor that I am aware of. No internal temperature shows in the app. That section is greyed out so I am unable to set a proffered temperature and no one asked about my preferences. The external temperature shows in the app. That must be in the external part of the heat pump as it hit 41 degrees in the sun yesterdays.

The fact that the app is greyed out could be because the controller is not receiving data from the missing item. The Outside Air Temperature (OAT) sensor should be showing the actual air temperature and not being heated by direct sunlight. This does not appear to be the case.

Do you have any manuals for the equipment?

@derek-m Guidelines for external temperature sensors usually suggest they are mounted on a northerly wall and in the shade - if attached to the heat pump (as mine is) it is placed at the back in the air flow and in shade but spaced away from the body of the pump itself. Regards, Toodles.

Posted by: @toodles

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@johnmo I would have thought you would have the ability to set your preference for temperature - even if you don’t need a schedule if you are running the heating 24/7/365? Inquisitively, Toodles.

Temp change is by tweaking the WC curve up or down.

Just been modifying that, curve for cooling it moves between 14.5 and 15.5 degree, between 20 and 30 degs OAT, so just about flat. For heating between 10 and -9 OAT goes between 26 and 29 Deg flow temperature. Both curves are to ensure an almost steady 21 degs inside. Underfloor heating - not radiators. May need to shift the curve to compensate for defrosts, will see.

@toodles @derek-m No manuals or any paperwork of any kind were left behind. I will have a look again tonight to see if they placed a OAT sensor in a shady spot that I may have missed, maybe at the back of the heat pump. The Heat Pump sits South West facing and gets a lot of sun. 

I have just spoken to Aira. They are going to schedule a visit in 3 weeks as I'm about to go on holiday. They say the engineers should have been able to force the unit to heat so they are not sure why this wasn't done to test the rads. They hope that the thermostats will be available at the time to bring with them in 3 weeks. They said that they do not supply the thermostats in other regions and that it is being produced for the UK marked. 

Posted by: @mikeh

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Heat Pump sits South West facing and gets a lot of sun. 

If the oat sensor is getting affected by sun light that may be why they couldn't get it to start up when they tried - reading way to high. This WILL be an issue during the heating season and you should snag it as an issue. If the sun is affecting the oat reading this will move your weather compensation curve and not get the correct flow temperature when you need it.

There is no separate sensor outside that I can see but I think there is a temperature sensor built into the body at the back of the heat pump. See picture from the back on the right side of the heat pump. This is similar location to what is shown in the diagram I found on an online Aira installers manual. If this is the OAT Sensor then it will be catching direct sunlight when the sun is high in the sky. May not catch the sun when it rises lower in the winter though. 

I would put some trellis on the corner where the hose pipe is and grow something up it to stop the sun getting your temperature probe.

@johnmo That’s the badger!, I wonder whether it can be relocated on the left side or if not, an external sensor might be fitted to the wall just round the corner near the existing trellis? The other possibility I can think of is placing it on the back face? This would have the advantage of when it is running, it will always be reading the temperature of the air flowing into the unit. Regards, Toodles.

@johnmo I guess it's a balancing act between the possibility of restricting air flow vs the benefits of shading the sensor. Maybe I'll test putting some sort of 3 inch lip on the back and right side of the unit and see if it reduces the displayed temperature in the app.