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Vaillant Arotherm monobloc error f.788 - ASHP is not working!

 
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Air Source Heat Pumps (ASHPs)
Last Post by Fxd 7 months ago
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 iancalderbank
(@iancalderbank)
Noble Member Contributor
3640 kWhs
Joined: 2 years ago
Posts: 644
14/03/2023 10:08 am  

@william1066 so my system did the experiment for me today.

I currently have a commissioned ASHP, the flow side goes to a 50L volumiser, then there is temporary shortcut (i.e. a bypass) back into the return side. I temporarily created demand so the ASHP has warmed up the water in the circuit and volumiser. the routes from the ashp's f+r circuit into the house are currently capped - there is no load on the ashp. the house is  still on the boiler.

the graph starts when I got modbus working yesterday evening. RWT goes below 25 right at the start but nothing comes on. When Outside temp goes below 4C, the system switches the circulation pump on. But not the compressor. the lukewarm water in the circuit must be enough to satisfy the warmth needs of the outdoor unit. After that, the pump is leaving  "off" gaps of 60 minutes then running for about 6-8 mins each time. I'm not sure what the "off" trigger is at the end of the "on" period. It'll be interesting to see how cool it gets before it puts the compressor on.

image

My octopus signup link https://share.octopus.energy/ebony-deer-230
210m2 house, Samsung 16kw Gen6 ASHP Self installed: Single circulation loop , PWM modulating pump.
My public ASHP stats: https://heatpumpmonitor.org/system/view?id=45
11.9kWp of PV
41kWh of Battery storage (3x Powerwall 2)
2x BEVs


   
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 william1066
(@william1066)
Reputable Member Member
1333 kWhs
Joined: 1 year ago
Posts: 206
17/03/2023 6:01 pm  

Posted by: @iancalderbank
↑

I'm not sure what the "off" trigger is at the end of the "on" period.

Probably just "x" amount of time


   
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 Fxd
(@fxd)
New Member Member
20 kWhs
Joined: 7 months ago
Posts: 1
29/10/2023 2:35 pm  

Hi, 

I have the same Error F788 did you finally fix it? 
Coule you please tell me Howell did you do? 
thanks for tour help


   
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