Renewable Heating Hub Heat Pump Forums

Search with Wattson
Forums
Renewable Heating
Air Source Heat Pum...
Samsung/Joule Gen6
 
Notifications
Clear all

Joining the Renewable Heating Hub forums is completely free and only takes a minute. By registering you’ll be able to ask questions, join discussions, follow topics you’re interested in, bookmark useful threads and receive notifications when someone replies. Non-registered members also do not have access to our AI features. When choosing your username, please note that it cannot be changed later, so we recommend avoiding brand or product names. Before registering, please take a moment to read the Forum Rules & Terms of Use so we can keep the community helpful, respectful and informative for everyone. Thanks for joining!

Samsung/Joule Gen6

 
Air Source Heat Pumps (ASHPs)
Last Post by Mars 10 months ago
2 Posts
2 Users
1 Reactions
886 Views
RSS
 Isaac
(@isaac)
New Member Member
Joined: 10 months ago
Posts: 1
Topic starter 05/12/2025 11:12 am   [#2654]

Two year old system, serviced annually has repeatedly shutdown with E911 error code. 
ASHP filter has been cleaned of debris 3 times (non ferrous). 
any ideas why this keeps happening every 3-4 days.  
thanks in advance. 
Paul 
photo attached 

IMG 1212
IMG 1213


   
👍
1
Quote
Mars
 Mars
(@editor)
Illustrious Member Admin
Joined: 6 years ago
Posts: 4911
05/12/2025 11:24 am  

Welcome to the forums @isaac. What you’re describing is really common on systems that weren’t flushed properly at installation. We went through something very similar with our own heat pump, and the good news is that if you keep on top of cleaning the strainer, the issue usually settles down over time.

From the photo, it looks like you’ve got a mix of general sludge and early-stage corrosion. The sludge/gunk will clear with repeated cleaning (in our case it took around a dozen cleans before it finally calmed down) but any corrosion you’re seeing won’t go away on its own.

E911 on a Samsung is (from memory) a flow-related error, and it’s extremely common when the strainer starts to clog. If it’s reappearing after three or four days, I’d honestly be cleaning the filter once or twice a day for a little while just to get ahead of it.

Remember to keep an eye on your expansion vessel pressure.

Once the biological/algae-like sludge has stopped appearing, it’s worth getting a proper inhibitor/biocide into the system. This Fernox one works well with low-temperature systems: https://amzn.to/3MiBpr4

You can add it through a towel rail. There’s a strong chance your original installers didn’t dose the system at all, so get a bottle in now and then ask your installer to check the levels properly at your next service.


🔥 Britain’s Heat Pump Shitshow
How Installing a Heating System Became a National Nervous Breakdown
Free UK shipping.
📗 Heat Pumps Explained
A Jargon-Free Guide for Homeowners
Rewritten and updated for 2027
📘 From Zero to Heat Pump Hero
🛠️ Bodge Buster
New to heat pumps?
Take the Heat Pump Fundamentals course and use INTRO50 at checkout for 50% off.


   
ReplyQuote
Forum Jump:
  Previous Topic
Next Topic  
Share:

SPONSORS

Join Us!

Installer Finder

Degrees of Separation

Latest Posts

SPONSORS

Click to access the login or register cheese
Protected By
Shield Security PRO