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Air Source Heat Pumps (ASHPs)
Last Post by batalto 3 years ago
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Mars
 Mars
(@editor)
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Joined: 5 years ago
Posts: 3844
02/11/2021 10:12 am  
Posted by: @batalto

At this exact moment I have an E0 low flow fault on my system. Essentially it refuses to run as it thinks the flow rate is too low for the pump... So no heating... Plumber is coming tomorrow, apparently there is a filter to clean out? Why I wasn't shown how to do this is beyond me. I'm sure I could have it out in 5 minutes and everything running again. Hot water is at least full, but wife and baby are not happy about a cold night. Typically it's quite chilly this evening as well. Hopefully the house holds the temperature this evening.

 

This has happened to us twice. The dreaded filter. Ours was located in a silly place and we had it moved as part of our last maintenance so that's much more accessible. You'll find that there's some corrosion in the filter hindering flow. 

Ridiculous that you weren't told about this.


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 batalto
(@batalto)
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Posts: 1092
Topic starter 02/11/2021 10:20 am  

@editor plumber will be here later in the day and i've asked him to show me how to do it myself. House was pretty good overnight and seems to have held temperature well. Luckily we have lots of solar gain in the day and we ran the A2A this morning to heat things up - worked very well to get rooms up to temperature. Just doesn't heat up the whole house


12kW Midea ASHP - 8.4kw solar - 29kWh batteries
262m2 house in Hampshire
Current weather compensation: 47@-2 and 31@17
My current performance can be found - HERE
Heat pump calculator spreadsheet - HERE


   
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 batalto
(@batalto)
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Topic starter 02/11/2021 10:22 am  

@heacol I've reset it several times - it works for a bit, then conks our again with E8 fault (low flow rate). E0 is just E8 three times in a row.


12kW Midea ASHP - 8.4kw solar - 29kWh batteries
262m2 house in Hampshire
Current weather compensation: 47@-2 and 31@17
My current performance can be found - HERE
Heat pump calculator spreadsheet - HERE


   
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 Brendon Uys
(@heacol)
Noble Member Contributor
Joined: 4 years ago
Posts: 415
02/11/2021 10:38 am  

@batalto Have you turned your thermostats and TRV's up full?

 



   
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 batalto
(@batalto)
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Posts: 1092
Topic starter 02/11/2021 10:41 am  

@heacol yes - it trys for a bit, you can hear the water flowing, but then it stops and pulls the error message


12kW Midea ASHP - 8.4kw solar - 29kWh batteries
262m2 house in Hampshire
Current weather compensation: 47@-2 and 31@17
My current performance can be found - HERE
Heat pump calculator spreadsheet - HERE


   
ReplyQuote
 Brendon Uys
(@heacol)
Noble Member Contributor
Joined: 4 years ago
Posts: 415
02/11/2021 11:53 am  

@jeff Based on those figures, I am drastically undercharging!!



   
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 batalto
(@batalto)
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Posts: 1092
Topic starter 02/11/2021 12:06 pm  

Now fixed - pulled out the filter and it was completely gunked up with crap. Washed it out, popped it back in and reset the unit. No issues, all running fine again. Literally a 3 minute job. Next time I'll just do it myself. I am amazed by the amount of rubbish in there though. Goes to show that my old system never had a gauze filter, only a magnetic one. As a side note, the pipes are now silent whereas before they made a noise - I guess as the water tried to push past the blockage.

Also its very usefully located inside the house/boiler cupboard. Just need to get the right wrench now.


12kW Midea ASHP - 8.4kw solar - 29kWh batteries
262m2 house in Hampshire
Current weather compensation: 47@-2 and 31@17
My current performance can be found - HERE
Heat pump calculator spreadsheet - HERE


   
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Mars
 Mars
(@editor)
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Joined: 5 years ago
Posts: 3844
03/11/2021 11:13 am  

@batalto, that happened to us too. Once you know where the filter is, it's super easy to clean. Takes a few minutes. Are you up and running again now. We also discovered that once the filter was cleaned, it would clog again a few minutes later, and after 2-3 'flushes' it would be clean and run normally for a lengthy period of time.


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Mars
 Mars
(@editor)
Illustrious Member Admin
Joined: 5 years ago
Posts: 3844
03/11/2021 11:14 am  

This is where our filter used to be and how we cleaned it. It's now near the cylinder so much easier to clean.


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 batalto
(@batalto)
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Topic starter 03/11/2021 11:16 am  

@editor yes all running again fine. House is very warm, but I think this is due to radiator balancing. Its amazing the difference balancing them has made. Its still not perfect as one is basically still cold and the others are warm. Maybe a pump upgrade might be useful or as Heatcol is suggesting that we just use the ASHP inbuilt pump power


12kW Midea ASHP - 8.4kw solar - 29kWh batteries
262m2 house in Hampshire
Current weather compensation: 47@-2 and 31@17
My current performance can be found - HERE
Heat pump calculator spreadsheet - HERE


   
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 batalto
(@batalto)
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Joined: 5 years ago
Posts: 1092
Topic starter 03/11/2021 10:10 pm  

@editor I check it again this evening and this is the result. One day and it's gunked up again. I think I'll check it everyday for the next week and see just how much is building up. At least it's a 2 min job to do it.

IMG20211103220555

 


12kW Midea ASHP - 8.4kw solar - 29kWh batteries
262m2 house in Hampshire
Current weather compensation: 47@-2 and 31@17
My current performance can be found - HERE
Heat pump calculator spreadsheet - HERE


   
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2
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Mars
 Mars
(@editor)
Illustrious Member Admin
Joined: 5 years ago
Posts: 3844
04/11/2021 8:18 am  

@batalto, we changed our distribution pump and it made a world of difference. And you’re right, radiator balancing is extremely important.


Get a copy of The Ultimate Guide to Heat Pumps

Subscribe and follow our YouTube channel!


   
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