Mitsubishi ecodan ASHP no heating

UnicornGirl81

Please can anyone shed any light on how this system should work? 

I live in a social housing new build with an air source heat pump. 

Underfloor heating downstairs and radiator’s upstairs controlled by a typical wall dial thermostat. 

Heating & hot water worked perfectly fine when I moved into the property in March this year. 

Obviously didn’t use heating throughout the summer. Turned up the thermostats toward the end of September to check all was ok before winter but no it wasn’t working. 

I’ve had several plumbers out from the contractors to try and solve the issue, decided it was an issue with the pumps so they came out today and replaced both the underfloor heating and the radiator pumps. Was told to leave it on the compensation curve setting and to leave it to run its cycle as hot water takes priority over the heating.
the heating will start and the underfloor heaters will take 2 to 3 hours to reach temperature. But the radiators upstairs will warm straight away. 

That was 8 hours ago now and the heating just will not kick in. 

The thermostats for underfloor heating are set to 24 degrees and the radiator one is set to 25 degrees. The room temperature is currently 18 degrees so it should be kicking in. 

The hot water is working perfectly fine and has the play symbol next to it but the heating goes to play for 5 minutes or so then back to standby. 

I’m at my wits end I’ve stayed home for 3 days of this week waiting in for them to look at and attempt to fix it. Feels like they don’t really know what they’re doing to be honest. I was assured it would work perfectly fine after changing the pumps. 

Please help if you can
thank you

Mstty

Is the play icon showing on your FTC controller as per the below pic?

UnicornGirl81

Mstty said:

Is the play icon showing on your FTC controller as per the below pic?

Hi and thanks for your reply

its currently showing this 

Mstty

Ok two things there your hot water is on (play button shown) and it is using the auxillary electric heater (the flash symbol).which means it's burning through electricity.

Firstly press the far right of the four buttons (the document and arrow type symbol) and post the picture of what you have there.

UnicornGirl81

Mstty said:

Ok two things there your hot water is on (play button shown) and it is using the auxillary electric heater (the flash symbol).which means it's burning through electricity.

Firstly press the far right of the four buttons selected the document and arrow type symbol and post the picture of what you have there.

So this is what I’ve got

Mstty

Lovely.

So we need to stop the hot water heating to see if the heating comes on.

Press the second button under the tap with the play symbol til it show ø (that means off).

Then go back to the main screen menu where the hot water tap symbol should turn to the stop symbol and after a little while the heating will switch to play.

UnicornGirl81

Mstty said:

Lovely.

So we need to stop the hot water heating to see if the heating comes on.

Press the second button under the tap with the play symbol til it show ø (that means off).

Then go back to the main screen menu where the hot water tap symbol should turn to the stop symbol and after a little while the heating will switch to play.

Great thank you I will do that and post back on here in a little bit to let you know if it worked or not. 

UnicornGirl81

UnicornGirl81 said:

Mstty said:

Lovely.

So we need to stop the hot water heating to see if the heating comes on.

Press the second button under the tap with the play symbol til it show ø (that means off).

Then go back to the main screen menu where the hot water tap symbol should turn to the stop symbol and after a little while the heating will switch to play.

Great thank you I will do that and post back on here in a little bit to let you know if it worked or not. 

Right so I’ve let it do it’s thing for an hour 
the play symbol on the heating comes on for a few minutes then switches back to the pause symbol. There’s been no heat going to the radiators at all

Spoonie_Turtle

Is the 0℃ a problem?  I can see there's a compensation curve symbol and I don't know how that works, but I wonder if that's possibly overriding any other thermostat settings.

Mstty

Spoonie_Turtle said:

Is the 0℃ a problem?  I can see there's a compensation curve symbol and I don't know how that works, but I wonder if that's possibly overriding any other thermostat settings.

That's normal that just refers to how many degrees up or down you want to adjust your weather compensation curve. So a nice warm day like today you might want to put -2 or -3 on it

Mstty

Hi OP

So this is ours this morning can you confirm when your heating switches to play does the radiator type symbol appear. This signifies the heat pump outside is running.