System pressure dropping on my Ecodan ASHP system
I have an Ecodan ASHP, due to some building works the hot water cylinder was relocated and some legs have been run for 3 more radiators which have yet to be fitted.
Hot water has been fine since the relocation of the cylinder around 4 weeks ago. This weeknd I put the heating on, all was fine but next morning when the hot water cycle ran before the heating comes on there was a U1 fault which I believe is a low pressure fault.
So I filled the system to about 1.7bar when heating was on and bled the radiators. I manually put water cycle on and cylinder had hot water.
Next morning after heating had been on before same problem. It seems that when I fill the system within about 30 mins pressure drops to 1 bar or less, however all rads are nice and hot.
Any ideas? Thanks.
@spacebiscuit - this is an interesting question, why does an ASHP circuit need to be pressurised in the first place? I can't be, as it is with a traditional car radiator system, so the water can get to a higher temperature without boiling, since ASHPs don't get anywhere near those temps. I have a very very small leak, at least I assume it is, in my primary circuit, that causes the pressure to drop very slowly (over days if not weeks) and yet the system seems to run the same whatever the pressure, as long as the circuit has fluid in it, which it does. Maybe the pressure is there to stop negative pressure that would perhaps allow air to enter? Does anyone know the answer?
Midea 14kW (for now...) ASHP heating both building and DHW
Hello i am an ASHP Engineer and new to this group. Ecodan U1 code is said to be high pressure fault,which is cause by abnormal water flow on the primary circuit. I recommend get ASHP engineer to come have a look.
- 26 Forums
- 2,242 Topics
- 49.9 K Posts
- 202 Online
- 5,903 Members
Join Us!
Podcast Picks
Latest Posts
-
@majordennisbloodnok Good explanation I thought ὠ...
By bontwoody , 8 minutes ago
-
RE: Mitsubishi Ecodan R290 10kW performance
I am using my Powervault electricity monitoring App to ...
By Ecoste , 20 minutes ago
-
RE: Daikin Octopus installation update - I saw my first defrost. 😍😂
After installation the system did develop a noise in th...
By RadWhisperer , 31 minutes ago
-
RE: Help me keep the faith with my air source heat pump installation
@jamespa it doesn’t seem to matter the outside temp it ...
By AdamK , 57 minutes ago
-
Apologies as my post clearly interrupted this flow. Whe...
By Batpred , 2 hours ago
-
RE: One room is colder than the rest of the house
I would personally be sceptical about reaching any conc...
By JamesPa , 3 hours ago
-
RE: My experience with 3 heat pump surveys: Heat Geek, British Gas & Octopus
If you paid for any of the assessments try asking for t...
By JamesPa , 4 hours ago
-
@drei Thats a nice designer radiator which it would ...
By JamesPa , 4 hours ago
-
I've created a separate post here, wondering about radi...
By DREI , 5 hours ago
-
RE: Air source heat pump roll call – what heat pump brand and model do you have?
@ecoste, @walnut-tree-cottage these are both great piec...
By JamesPa , 6 hours ago
-
RE: New build installation query
That suggests to me that you have loss of heat in the p...
By Transparent , 8 hours ago
-
RE: Solar inverters - where does the energy go when clipping?
You will, of course, check the dimensions and weight be...
By Transparent , 11 hours ago
-
RE: Midea ASHP – how to set weather compensation
@pash44pump - there may be other ways you can improve t...
By cathodeRay , 12 hours ago
-
RE: What should we do with our Aga?
@annahickson We had a similar dilemma with our oil-fire...
By Morgan , 12 hours ago
-
RE: The Hidden Secret to a Successful Heat Pump: Pipe Size Matters
17l/min is enough for only 6kW at 5C DT, not surprising...
By JamesPa , 14 hours ago
-
@bontwoody The extra battery capacity is the solution f...
By Toodles , 14 hours ago
-
RE: End of Summer Time Reminder to Ecodan owners
As I understand it....ha....Melcoud will over ride any ...
By Abernyte , 14 hours ago
-
Finding flow temp data from Samsung 16kw HP
Hello, I have a Samsung MIM-E03 16kwh heat pump, and ...
By martingale , 23 hours ago
-
RE: Faulty Clivet heat pump out of the box
We would never win these projects as we spend 1 whole d...
By ASHP-BOBBA , 1 day ago



