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Vaillant Arotherm Plus PCB Failure

Air Source Heat Pumps (ASHPs)

Last Post by pdfreeman 2 years ago

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pdfreeman

(@pdfreeman)

Active Member Member

Joined: 3 years ago

Posts: 3

Topic starter 20/02/2023 4:03 pm

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!!

This topic was modified 3 years ago by pdfreeman

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Vaillant aroTherm failure

WIMDEBOYSERE

(@wimdeboysere)

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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)

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Joined: 5 years ago

Posts: 4427

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.

This post was modified 2 years ago by Mars

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pdfreeman

(@pdfreeman)

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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)

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Posts: 4427

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)

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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?

👍

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Mars

(@editor)

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Joined: 5 years ago

Posts: 3563

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

(@editor)

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Joined: 5 years ago

Posts: 3563

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?

Buy a copy of the The Ultimate Guide to Heat Pumps

Subscribe and follow our Homeowners’ Q&A heat pump podcast

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Abernyte

(@abernyte)

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Joined: 3 years ago

Posts: 241

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)

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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)

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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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