Vaillant Arotherm Plus PCB Failure
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!!
Hi, I have the same problem. Same place, what was the cause of the problem?
thx for the reply,
wim
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.
@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!
Posted by: @derek-mYour 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.
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?
@pdfreeman did you have to pay for the replacement and did Vaillant offer any information on what may have caused this?
Buy Bodge Buster – Homeowner Air Source Heat Pump Installation Guide: https://amzn.to/3NVndlU
From Zero to Heat Pump Hero: https://amzn.to/4bWkPFb
Subscribe and follow our Homeowners’ Q&A heat pump podcast
@wimdeboysere did you have your system installed after pdfreeman’s and how long has yours been installed?
Have you raised it with Vaillant?
Buy Bodge Buster – Homeowner Air Source Heat Pump Installation Guide: https://amzn.to/3NVndlU
From Zero to Heat Pump Hero: https://amzn.to/4bWkPFb
Subscribe and follow our Homeowners’ Q&A heat pump podcast
Did the fried slug on the left have anything to do with the failure or was it collateral damage!
-
Vaillant arotherm plus heat pump frost protection
3 months ago
-
Vaillant aroTHERM plus not level or flat - what base is best under an external unit?
6 months ago
-
Vaillant Arotherm monobloc error f.788 - ASHP is not working!
6 months ago
-
British Gas versus Octopus: Two possible heat pump routes - how to evaluate them?
7 months ago
-
Volumiser placement in Vaillant Arotherm + system?
1 year ago
- 22 Forums
- 2,055 Topics
- 44.8 K Posts
- 40 Online
- 3,289 Members
Join Us!
Trusted Installers
Struggling to find a reliable heat pump installer? A poor installation can lead to inefficiencies and high running costs. We now connect homeowners with top-rated installers who deliver quality work and excellent service.
✅ Verified, trusted & experienced installers
✅ Nationwide coverage expanding
✅ Special offers available
Latest Posts
-
RE: Is your heat pump insured?
I am with Tesco Insurance and when I rang to check that...
By Jancold , 14 minutes ago
-
Win a 6-panel PV courtesy of egg and Renewable Heating Hub
Our epic giveaway just went live! Want to win a 6-pan...
By Mars , 10 hours ago
-
RE: Yes, the "zoning with ASHP" topic again...
James, thanks again for your thoughtful and persistent ...
By HarryRea , 10 hours ago
-
RE: Getting the best out of a heat pump - is Homely a possible answer?
Isn't that the whole point of homely - it does that fun...
By Johnmo , 12 hours ago
-
RE: Is this normal? Click of the DHW returning to space heating
So the Lone Ranger returned today! Even though we thoro...
By Grantmethestrength , 14 hours ago
-
RE: How To Balance Radiators & the Role of the Lockshield Valve: A Homeowner's Guide
@jamespa So settings to date are as follows for now. ...
By Alfapat , 14 hours ago
-
RE: Vaillant & OVO partner up to offer Heat Pump Plus
Hopefully iv done the right thing today by signing up t...
By Westkent , 15 hours ago
-
RE: IVT Greenline high pressure switch and electrical cassette errors
Hi, are you able to see the delta between GT8 vs GT9 te...
By abbote , 16 hours ago
-
RE: Battery sizing - How low can you go!
My own experience with connecting four batteries to thr...
By Transparent , 22 hours ago
-
RE: Plate heat exchanger considerations
Work on 2-3 percent per degree. This is a reasonable e...
By JamesPa , 1 day ago
-
RE: Advice for ground source heat pump in new build with PV and batteries
The useful bit is the bit that specifies the heat loss ...
By JamesPa , 1 day ago
-
RE: Volumisers in Heat Pump Systems: Does Placement Matter?
You’re absolutely right that during defrost the refrige...
By Mars , 1 day ago
-
@editor thanks Mars that’s the same table I found in th...
By Gary , 2 days ago
-
RE: Tariff and charging strategy advice please
They haven't asked me to prove that I have an EV (I do)...
By JamesPa , 2 days ago
-
RE: Solar Power Output – Let’s Compare Generation Figures
Took a while to find on the OFGEN site: ”The FIT sche...
By AgentGeorge , 2 days ago
-
RE: why solar diverters for HW instead of the heat pump?
For me there are few factors why you may want to heat w...
By Johnmo , 2 days ago
-
RE: Hydronic plinth heaters and ASHPs
@editor yes I think so. It will be a while until I get ...
By benson , 2 days ago
-
RE: Aira Heat Pump: Stylish Scandinavian Heating
I’m an Aira customer with a 6kW Outdoor Unit in a small...
By KevinPotts , 2 days ago
-
RE: Warm weather and heat pumps.
Just looked at my WC setting, it is programmed for 25 D...
By Johnmo , 3 days ago