UPDATED: Air Source Heat Pumps/Air Con - Full Info & Guide, is it cheaper to run than mains gas?

TiredGeek

nande2000 wrote: »

Have you spoken to IceEnergy ? I almost went with them. If you get a local plumber to do the install and Ice do the supply and comissioning it worked out quite reasonable and you get a proper design for your new system too - a note of caution though, they admitted to me they were oversizing by half a kw.

All I can say to that is: ROTFL

deano72_2

ecodan u1 fault keeps reapearing= pressure fault
its kingspan package with uf heating
the site agent got called out saturday to u1 fualt,he done a quick fix & just powered down as thats all he knows so fair enough. i went there yesterday & noticed the flow setter below 10,so set it between 12-15 as per mitsi recomendation,checked all valves open & pump speeds & flow setters on uf manifolds & 2 port valves & have 1.5 bar in the system dip swithces settings & all ok. i also took dhw target temp to 50c.advised occupant all mechanically running ok but no gaurantee that problem wont return as i know from other dans on site that u1 is common fault.get the call after work tonite that its gone out again on u1 so will have to attend in the morning.
these dans are coming up with u1 pretty often,tbh normally after a few tweeks here & there they usaully go away for atleast a month or two & no problem,pretty rare they appaer again the next day.
so whats your thoughts?
im just starting to wonder if its gas related,you can gaurantee the dans have not had the standing still period of 18hrs before swithcing on which im not sure would of efected the dan longterm

just to add a side note. i also disscovered about sw3 switch 5 setting,
weve been told by mitsi it is to be set to on,but this is maybe not the case.it depends if its new/old type pcb in ftc2.
you can find out what type it has by pressing few buttons on mitsi controlor. if its 300 or 400 sw3 no5 should be off
if its 500 then sw3 no5 should be on
if its set wrong what happens is the heating will not kick back in untill dhw times has finished its timed period rather than switch back to heating after dhw has reached its target temp.
its worh checking especially if you have quite generous dhw times programed

lovesgshp

Don't know the Ecodan, so would have to have a good read of the manual, before commenting.

lovesgshp

Well there are 16 possible faults shown under that code. Firstly check the filter on the cold flow, as this is a normal problem. You would need to work through each one as it is difficult to identify.

TiredGeek

Had a quick google and found this http://domesticheating.mitsubishielectric.co.uk/files/library/files/ecodan/Technical%20Brochures/W85%20Service%20Manual.pdf

U1 fault - most likely cause is low flow rate of the water through the ecodan.
What model is it, I didn't see if you told us? I'm assuming an 8.5kw model....
The min flow rate is 10 L/min and the max is 25.8 L/min, but you should be aiming for 14.3 L/min according to the specs.

You say you saw the flow lower than 10 on the flow setter so I'm guessing that's the problem.

deano72_2

geek. yesterday it was just below 10 so i thought that poss could be the problem.its 50 (5kw)model & according to the manual flow setter should be 6.5-14.3 but mitsi have told us that it should be between 12-15 which is what i set it to yesterday.
theres approx 260 units installed on site ranging from 12months old to 2 weeks old & u1 is the most common fault but i cant put my finger on it why.
geo- it has tf1 filter & thats fine
i have never worked on other makes, but would you say that high pressure fault is the most common one,they must all work on the same principle
something thats crossed my mind its a housing estate new build & as theres more & more occupants = water demand/usage i wonder if the mains pressure is flutating in peeks & troffs!

dullnote

Cardew I think the two of us are saying the same in different ways. The industries needs to get their act together and sell them with true expectations.

I spent two years reading everything I could about them, had companies telling me all sorts, some times I know more about the product.

You should not need to do this.

So to all ASHP installers get your act together before this ends up like solar panel fiasco. If RHI does come in this is what will happen

nande2000

TiredGeek wrote: »

All I can say to that is: ROTFL

Really? I know someone who they installed a GSHP for and he has nothing but praise for them.

grahamc2003

deano72 wrote: »

ecodan u1 fault keeps reapearing= pressure fault
its kingspan package with uf heatingd

I don't know whether this will help at all, but just as a point of information really. I've spoken to someone who had a Dimplex system fitted, which recorded several 'flow rate' faults. The cure in his particular case was to fit an extra pump, in addition to the built in one, on the circulating water through the rads. He recommended to me to put the extra pump in at installation, since he thought it could do no harm even if not needed. He was a user not an engineer though.

[Deleted User]

FYI - we have 3 pumps and never had that error.