Midea R32 Monobloc MHC-V12W in 1989 Detached House: Noise from Pipes/Airing Cupboard, DHW Schedule Not Always Heating – Advice Needed? - Air Source Heat Pumps (ASHPs)

RE: Midea R32 Monobloc MHC-V12W in 1989 Detached House: Noise from Pipes/Airing Cupboard, DHW Schedule Not Always Heating – Advice Needed?

Painter26 — Mon, 11 May 2026 13:40:38 +0000

Thank you!

RE: Midea R32 Monobloc MHC-V12W in 1989 Detached House: Noise from Pipes/Airing Cupboard, DHW Schedule Not Always Heating – Advice Needed?

Mars — Mon, 11 May 2026 13:23:02 +0000

@painter26, Leading Renewable Change have just got in touch and said that if you call them on 01293 851 459, press service and speak with Ella, they can arrange to send out an engineer. I have no idea wha their charge out fee is.

RE: Midea R32 Monobloc MHC-V12W in 1989 Detached House: Noise from Pipes/Airing Cupboard, DHW Schedule Not Always Heating – Advice Needed?

Wizard — Thu, 07 May 2026 18:59:42 +0000

@painter26 i am in Lightwater and midea trained. Sounds like a pretty straightforward issue but need to see for myself before recommending a plan/doing a fix

RE: Midea R32 Monobloc MHC-V12W in 1989 Detached House: Noise from Pipes/Airing Cupboard, DHW Schedule Not Always Heating – Advice Needed?

Painter26 — Thu, 07 May 2026 16:10:21 +0000

Thanks @editor

RE: Midea R32 Monobloc MHC-V12W in 1989 Detached House: Noise from Pipes/Airing Cupboard, DHW Schedule Not Always Heating – Advice Needed?

Mars — Thu, 07 May 2026 14:57:46 +0000

@painter26 thanks for bumping this up. I'll circulate this to my professional/installer network to see who'd be available to look into this and help.

RE: Midea R32 Monobloc MHC-V12W in 1989 Detached House: Noise from Pipes/Airing Cupboard, DHW Schedule Not Always Heating – Advice Needed?

Painter26 — Thu, 07 May 2026 14:52:50 +0000

Just bumping this up for @editor .

Are there any engineers local to Fleet in Hampshire who could advise on whether this is likely the expansion vessel that needs checking again after the new DHW tank was installed? I'm struggling to get any response from the original installer and I would like to resolve the trapped air issue and (very gradual) pressure loss.

RE: Midea R32 Monobloc MHC-V12W in 1989 Detached House: Noise from Pipes/Airing Cupboard, DHW Schedule Not Always Heating – Advice Needed?

Painter26 — Wed, 29 Apr 2026 10:32:09 +0000

@cathoderay great, thank you.

RE: Midea R32 Monobloc MHC-V12W in 1989 Detached House: Noise from Pipes/Airing Cupboard, DHW Schedule Not Always Heating – Advice Needed?

cathodeRay — Wed, 29 Apr 2026 06:38:11 +0000

@painter26 — that all makes sense. Space heating (the sun symbol in the middle panel) shows as off, and the leaving and returning water temperatures are the same, and low, at 17°C. Your space heating is off.

RE: Midea R32 Monobloc MHC-V12W in 1989 Detached House: Noise from Pipes/Airing Cupboard, DHW Schedule Not Always Heating – Advice Needed?

Painter26 — Tue, 28 Apr 2026 21:02:51 +0000

@cathoderay I turned the room stat down to 12 degrees earlier this evening which, predictably, turned off the space heating.

Here's my controller now (I should correct my previous post with my current WCC parameters which are 45 flow temp at -4 OAT / 25 flow temp at 15 OAT):

14946

14943

RE: Midea R32 Monobloc MHC-V12W in 1989 Detached House: Noise from Pipes/Airing Cupboard, DHW Schedule Not Always Heating – Advice Needed?

benson — Tue, 28 Apr 2026 18:34:53 +0000

I could keep my settings as they are but even at night I get a lot of residual solar gain as the house is directly south facing so I would not need the space heating to kick in on a cold night

For this reason as said before I would just turn it off.