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Vaillant Arotherm Plus PCB Failure

 
Air Source Heat Pumps (ASHPs)
Last Post by pdfreeman 2 years ago
11 Posts
5 Users
4 Reactions
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 pdfreeman
(@pdfreeman)
New Member Member
Joined: 3 years ago
Posts: 3
Topic starter 20/02/2023 4:03 pm   [#846]

Hello all

I have a 5kw Arotherm Plus ASHP which was commissioned around 18 months ago however unused for around 9 months.

On restarting the system the ASHP was showing connected but wouldn't start then heat was requested (DHW or Heating) and after a few hours F.1117 Compressor Failure was shown.

Investigating further its evident that the 240vAC neutral on the PCB has failed - looks like it has overheated/melted.

Has anyone had similar issues and if so do you know the root cause? I've temporarily repaired the board which now means the ASHP is functional so I know this is the problem but before I replace the board I'd like to know why it happened and how to try and prevent it happening again!

I'll try and contact Vaillant directly also.

Thanks in advance for any advice!!

IMG 6951

 

IMG 6961

 

 



   
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Vaillant aroTherm failure
 WIMDEBOYSERE
(@wimdeboysere)
New Member Member
Joined: 2 years ago
Posts: 3
26/02/2024 1:22 pm  

Hi, I have the same problem. Same place, what was the cause of the problem? 

 

thx for the reply, 

wim



   
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 Derek M
(@derek-m)
Illustrious Member Member
Joined: 5 years ago
Posts: 4425
26/02/2024 1:32 pm  

Your original post must have fallen into the 'black hole' that appears to exist in the website from time to time.

Looking at the photos I suspect that the cause may have been condensation, possibly due to the heat pump not being used for 9 months.

 



   
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 pdfreeman
(@pdfreeman)
New Member Member
Joined: 3 years ago
Posts: 3
Topic starter 26/02/2024 1:41 pm  

@derek-m , @wimdeboysere - I've no idea what caused it - could see how potentially was condensation, didn't open the unit up prior to restarting it.

A new board is in and all has been fine since!



   
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 Derek M
(@derek-m)
Illustrious Member Member
Joined: 5 years ago
Posts: 4425
26/02/2024 1:53 pm  

Posted by: @derek-m
↑

Your original post must have fallen into the 'black hole' that appears to exist in the website from time to time.

Looking at the photos I suspect that the cause may have been condensation, possibly due to the heat pump not being used for 9 months.

 

It is difficult to tell from the photo's, but PCB's for outdoor use should be coated with a waterproof lacquer.

 



   
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 WIMDEBOYSERE
(@wimdeboysere)
New Member Member
Joined: 2 years ago
Posts: 3
26/02/2024 7:48 pm  

@pdfreeman 

I think the main board on the unistor is also Broken, screen shows connection failure and i cant measure power on the bus connection, Room thermostat is also dead.So the best thing tot do is put in a new main also of does it get power from the (dead)heatpump outside?

20240226 104718

 



   
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Mars
 Mars
(@editor)
Illustrious Member Admin
Joined: 5 years ago
Posts: 4763
27/02/2024 10:14 am  

@pdfreeman did you have to pay for the replacement and did Vaillant offer any information on what may have caused this?


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Mars
 Mars
(@editor)
Illustrious Member Admin
Joined: 5 years ago
Posts: 4763
27/02/2024 10:17 am  

@wimdeboysere did you have your system installed after pdfreeman’s and how long has yours been installed?

Have you raised it with Vaillant?


New to heat pumps? Take the Heat Pump Fundamentals course and use INTRO50 at checkout for 50% off.
Rewritten and updated for 2027
📘 From Zero to Heat Pump Hero
🛠️ Bodge Buster
🎧 Prefer to listen? Heat Pumps Explained


   
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Abernyte
 Abernyte
(@abernyte)
Reputable Member Member
Joined: 4 years ago
Posts: 264
27/02/2024 11:09 am  

Did the fried slug on the left have anything to do with the failure or was it collateral damage!



   
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 WIMDEBOYSERE
(@wimdeboysere)
New Member Member
Joined: 2 years ago
Posts: 3
27/02/2024 12:44 pm  

@editor it's installed in 2019 and worked fine untill now..



   
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 pdfreeman
(@pdfreeman)
New Member Member
Joined: 3 years ago
Posts: 3
Topic starter 27/02/2024 3:44 pm  

@editor I didn't find Vaillant very helpful to be honest, so ended up purchasing the PCB and installing myself, pretty straightforward and it has been fine since. 

 



   
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