kron77

Hi conor thanks for the reply. Yes, this sounds about what's happening. Definitely drops down to around 37 (flow temp) if the central eating has been running for long enough. OK i'll get onto my new company and ask them to check the 3-way valve wiring.

Thanks Nick! Yes, they are scheduled at different times. I'll try to take some photos but to be honest, it's a tight squeeze in there!

Hello, I have a mitsubishi ecodan R32 with a 200 litre unvented tank (mcdonald not ecodan). I got the cylinder installed over the summer (an issue with the old one) and no problems. When winter kicked in and I put on the central heating I have noticed that the cylinder is losing temp. It's quite significant (20 degrees sometimes). The old cylinder didn't do that (also mcdonald but only rated to 1.5bar). What has my installer done wrong? They have gone bust so i'd like to know the answer before I approach a new company.

Hi PhilT, Sorry! So the ecodan controller unit is reading 44 but when i test it with a thermometer on the closest outbound tap, i'm seeing it coming out at 52 degrees.

Hello. I have a mitsubishi ecodan R32 with a 200 litre unvented tank (mcdonald not ecodan). I'm seeing a big difference between the temp read on the system vs reality. For example, when it's saying the tank is at 44 degrees it's actually reading 52. This is causing the system to turn on more regularly to keep it at 50. Anyone seen this before and could anyone let me know where the problem would be? THank you

The answer to this was yes ?

Hi everyone I wanted to reply here with the latest in case anyone has this problem. This turned out to be a software issue with the FTC. My FTC was on version 12 I think and I got it upgraded to version 15 and the issue has since gone away, the immersion now only kicks in on the LP cycle. I hope this helps someone else, get Mitsubishi to come out and upgrade the FTC if you get this symptom!

I wanted to come back to this thread with an update. With the temp here in Edinburgh dipping to below 5 degrees now more often than not I just couldn't take the noise anymore, as the ecodan was running at full speed all of the time it was below 5 degrees. So I got mitsubishi out and they agreed to replace the whole ASHP. Unfortunately it didn't resolve the issue, at 5.1 degrees runs like a charm and super quiet. At 4.9 degrees it spins up to 63 decibels (I bought a proper decibel reader) and it never, ever comes down until the temp goes above 5 degrees. So in talking with the tech guys at mitsubishi he seems to think this is the freeze stat function kicking in. We checked and the freeze stat is at 5 degrees bang on. He mentioned that if they system is filled with glycol then you can switch this function off and it should then run at normal speed at any temp. So i'm waiting for a refractometer to come today to confirm the glycol settings and then if they are correct, i'm moving to switch off the freeze stat function. For anyone else out there with an ecodan this might be interesting. Also, I want to mention that there is a quiet mode setting for the ecodan r32. If you go into the settings you can find it and there you can choose 3 different settings of quietness. This will reduce the output somewhat, but will solve the immediate noise problem when below 5 degrees. My plan is to remove the freeze stat once I confirm the gycol vs going down the quiet mode as I'd rather have it running at full efficiency all be it without the fan speed increase. Will report back here when I switch off the freeze stat function.

yeah agree and i checked all the fans, they look fine.

that does make sense thanks @ProDave. I downloaded an app on the phone to register the decibel readings. I appreciate it won't be very accurate but the decibel reading yesterday when it was around 0 degrees was average 75db (peaking at 90) at one meter. The advertised decibel output for the ecodan is 49 at one meter. This morning - when the temp is up around 7 degrees it's back to it's normal sound output (haven't taken a reading yet). So I wonder what about the outside temp makes the ecodan run so loud? Might have to get the installer out, i don't think I can live with the noise every time the temp drops below 5 degrees c. Remember it wasn't doing a DWH at the time, just regular central heating and I reviewed the flow/return temps and they were pretty close together (normal sort of 5 degree drop).

@SteamyTea it's set to about 50 degrees but it wasn't doing a DHW cycle at the time.

Thanks @ProDave it was not doing a DWH cycle, it was on central heating for sure. It could of being doing a defrost I guess, didn't hang around long enough to check. Will keep an eye on it. May I ask why the ASHP works harder for DHW then for central heating? I've also noticed that it does work harder for DHW.

Hi - got my ecodan R32 installed in October and it's been purring away ever since quite nicely. This morning, in Edinburgh anyway, it was near on 0 degrees and there was a noticeably louder noise coming from he unit, as if the fans were spinning much faster etc. I gather it's normal for an ASHP to work harder, and therefore be noisier, when it's cold? When the manufacturer publishes its decibel rating, is it best case or worst case - i.e. on a lovely summers day when doing a DHW top up or at -5 degrees in winter? Thank you in advance!

thanks everyone for the replies, I have my installed coming today, this arms me with some great knowledge - probably look to get the contactor replaced and will look to lower the water temps to avoid it needing the immersion that often.

Hi! Recently installed an Ecodan R32 11kh. The DHW heating is causing me some concern. Depending on the outside temp, the immersion is kicking on. When it's mild outside, like today 12 degrees, it doesn't kick in at all to get it to 55 degrees C. When it was cold the other day, say around 6 degrees, it kicked the immersion on at 47 degrees to take it up to 55 degrees. So couple of questions really. 1. Is it normal for ASHPs to kick in the immersion at such a low temp (47 for example). I can understand, maybe, once a week needing it to go from 55 to 60 degrees when the system does its legionnaires cycle but 47 seems awful low to me. 2. When it kicks in the immersion the whole electrical component, like the box part, makes an almightly buzzing noise until it reaches temp. As I had to locate the electrical box outside of the cupboard, it's quite annoying and actually makes me worried there's going to be a fire soon. Is this normal does anyone know? Depending on the answer to number 1 - it would seem very odd to me that the benefits of using an ASHP to heat hot water would be outweighed by the inefficient immersion heater element coming on for the last N degrees. From what i've heard immersion heating will cost a bomb, so to have 80% of your hot water heated economically will be outweighed by the last 10-20% being heated by immersion. A £7000 piece of kit surely can do it without immersion to 55 degrees even when it's 6 degrees outside. Any advice greatly appreciated!