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F.788 Building circuit pump reports internal fault - Vaillant Arotherm

 
Air Source Heat Pumps (ASHPs)
Last Post by jeegnesh 2 years ago
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 jeegnesh
(@jeegnesh)
Estimable Member Member
Joined: 2 years ago
Posts: 100
Topic starter 08/03/2025 6:14 pm   [#2179]

I spoke to soon and thought everything was going good.  Vaillant Arotherm+ 10kw installed mid Oct 2024 so 5 months old and woke up to see this error on the app F.788 Building circuit pump reports internal fault

I did try reset same error along with compressor blocked.  I cleaned the magnetic filter and the other mesh filter as advised by my installer, there was a small about of build up, not terrible.

Restart and back to the same error.  I have booked a Vaillant warranty visit but not happening till end of the week, just wondering if anyone else has run into this, pretty disappointed right now.


13.6kw Solar, 40kw Battery, 10kw Heat Pump and EV Cars


   
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Toodles
 Toodles
(@toodles)
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08/03/2025 6:27 pm  

I take it that ‘the other mesh filter’ is the ‘Y’ strainer filter? Regards, Toodles.


Toodles, heats his home with cold draughts and cooks food with magnets.


   
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 jeegnesh
(@jeegnesh)
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Topic starter 08/03/2025 6:30 pm  

@toodles yes it’s the strainer plastic with metal mesh the one you use your finger to pull out and only fits one way.


13.6kw Solar, 40kw Battery, 10kw Heat Pump and EV Cars


   
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Toodles
 Toodles
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08/03/2025 6:37 pm  

@jeegnesh Then you are pretty much at their mercy until they can send that engineer aren’t you?😒 Toodles.


Toodles, heats his home with cold draughts and cooks food with magnets.


   
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 jeegnesh
(@jeegnesh)
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Posts: 100
Topic starter 08/03/2025 6:52 pm  

After bleeding and then topping up water is there anything needs bleeding?


13.6kw Solar, 40kw Battery, 10kw Heat Pump and EV Cars


   
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Toodles
 Toodles
(@toodles)
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09/03/2025 11:17 am  

@jeegnesh I take it that the ‘topping up’ is the opening of the two valves on the red pressure tank (until the gauge indicates ~1.5 bar, usually indicated with a red line) and then closing the two valves again? I’m not aware of anything else that needs doing after that. Regards, Toodles.


Toodles, heats his home with cold draughts and cooks food with magnets.


   
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 jeegnesh
(@jeegnesh)
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Joined: 2 years ago
Posts: 100
Topic starter 09/03/2025 10:30 pm  

Guess I have to wait for engineer visit. I really hope they come with a pump in case it is the fault. 


13.6kw Solar, 40kw Battery, 10kw Heat Pump and EV Cars


   
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