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!
Last seen: Jun 8, 2026
JamesPa. Data for the 26 November -4C OAT during night. 11C OAT during latter day. Water Temperature FIXED @ 31C. This temperature is a litt...
JamesPa I plan to send you a chart tomorrow of todays (26th) result. Just to make sure I am giving you what data you need.
I wish I had only 9 defrosts in that timeframe. I had 16 in the early morning of just the 26 Nov.
Sim0n0. I also have the Hitachi Yutaki system. Also having lots of problems.
Thank you for the reply. I think you are saying that what I am seeing is normal (Evaporator -23C. OAT -4C. Defrost cycle every 46 minutes). ...
You could be right in that it's a region between the 2 dotted lines. It's not clear to me what the chart really means, not my area of knowledge. May...
Concerned about the noise and build up of ice. I believe that the evaporator should not be getting down to -23C, based on the algorithm. If I am inte...
Yes the unit always performs its defrost cycle, every 40 minutes, and the ice always clears. With the evaporator at -23C when it starts its defrost c...
Thank you. The pipe work is now insulated. Finding a heating eng that knows Hitachi units in this area is difficult. However, as you said a quali...
It sounds like its ice build up and does not sound good. Looking at the algorithm it looks like I am set to the Jo-0 setting, but I don't fully under...
I suspect it's ice build up. Just does not sound right.
SPONSORS
Degrees of Separation
Latest Posts
-
RE: Say hello and introduce yourself
@singlespeed potentially the first Haier heat pump on t...
By Mars , 3 hours ago
-
It's not that other passport users may or may not have ...
By Transparent , 4 hours ago
-
RE: GivEnergy inverter tripping due to over-voltage?
@tim441 to my mind, this intervention by SSE hasn't tol...
By Transparent , 4 hours ago
-
RE: Minimum and Zero Disrupt Heat Pump Installations
@l8again It seems you did very well. With our HG h...
By Batpred , 8 hours ago
-
RE: British Gas vs Octopus Energy vs Heat Geek vs EDF vs Aira vs OVO vs EON.Next vs Boxt
Just wondering how you went in the end? A guaranteed 40...
By Batpred , 8 hours ago
-
RE: Cooling with air to water heat pumps
Its really a non starter unless designed that way to st...
By dgclimatecontrol , 13 hours ago
-
RE: Vaillant Arotherm Pro vs new Plus
That makes sense. If the heat transfer into a cylinder ...
By Batpred , 14 hours ago
-
RE: What is the Heat Geek Guarantee?
Thanks, we also heard about the thermal store, to be us...
By Batpred , 14 hours ago
-
RE: Growatt battery disconnected
Morning folks! I can finally let you know that I have...
By Eliuccio , 14 hours ago
-
Sadly we also have rodent damage to the hot water syste...
By AliRam , 1 day ago
-
RE: MCS 2.0 - Changes in January 2025
I so recognise that. My first employer, which I worked...
By JamesPa , 1 day ago
-
RE: Outdoor Battery Solutions?
For us, adding a 16kwh battery means a heatpump can red...
By Batpred , 1 day ago
-
RE: UPS to keep broadband and wifi available during power outages
I have used APC UPS for as long as I can remember for h...
By Old_Scientist , 1 day ago
-
Octopus Fan #3 Bodmin Moor IFISA — Fastest Offer Close Ever?
I had notification of an offer from Octopus Energy to i...
By Toodles , 1 day ago
-
Thanks, @ashp-bobba. That confirms me in not wanting to...
By Majordennisbloodnok , 2 days ago
SPONSORS
