Help please. clear alarm?

[Post and beam]

I had a loss of pressure on my Vaillant 5kw heat pump. I have restored the pressure but my appbelieves there is still the 'low pressure' condition. Therefore it will not switch on. Is there a way to clear the alarm condition please.  I have no heating currently.

[JohnMo]

Call your installer

[Post and beam]

11 minutes ago, JohnMo said:

Call your installer

That isn't going to yield a result on a sunday morning.      As it happens i cycled the power via the rotary switch outside.  Good old 3 pin re set fixed it.   I have a persistent pressure loss issue for which the installer has been engaged. I need to top up the pressure by half a bar every day, which immediatley brings the system back online. The installer is not very responsive. But this total loss of pressure overnight appears to have put the system into sulk mode. 

[Nickfromwales]

Yup. Just off for 30 seconds and back on should do it. 

[Beelbeebub]

1 hour ago, Post and beam said:

... I need to top up the pressure by half a bar every day..... 

That's a serious volume of water being lost. If you don't know where it's going (eg a leaky prv is dumping it down the tundish) I'd be really concerned about damage to the fabric of the building. 

 

Something somewhere is going to be soaked and that is never a good thing. 

[Post and beam]

There is one tundish below my red pressure vessel. The water is not draining down through it. If there are others i do not know where they are.  I have the same fear of a serious leak somewhere. But, as this has been happening for the 6 weeks we have occupied the house i would expect to see water damage by now if it were inside.

[Beelbeebub]

2 hours ago, Post and beam said:

There is one tundish below my red pressure vessel. The water is not draining down through it. If there are others i do not know where they are.  I have the same fear of a serious leak somewhere. But, as this has been happening for the 6 weeks we have occupied the house i would expect to see water damage by now if it were inside.

You'd be surprised. 

 

If the leak was in thr 1st floor or loft, I would expect you to see something. 

 

But if it's the ground floor, depending on location and construction you might not. 

 

A property had a persistent leak. Half a bar a week. 

 

No sign of water. 

 

Clue cam in autumn when kitchen windows had bad condensation. 

 

Check with humidity monitors showed high humidity in kitchen. 

 

Eventually found a failed joint leaking to under the kitchen floor. The construction  was a oncrete slab, with 2" timber battens, then floorboards, a 5mm ply layer and then lino.

 

When we lifted the floor there was about an inch of water. 

 

If you have a suspended floor or even a slab, water could be leaking and you not know. 

 

Get hold of a couple of humidity meter (these are good https://amzn.eu/d/bMbXgA2)

 

Stick them in varouhs rooms for a few days and see if you can find one that has higher humidity than the others. That may give you a clue. 

 

 

[Nickfromwales]

Close off one UFH loop at a time (one per 24hrs) and then reopen and close the next one along, and keep

going until you’ve proven the leak doesn’t stop when a particular loop is isolated (remember you MUST close off flow and return tightly or the test won’t work, so righty-tighty for flow gauge and the blank caps on the lower). 
 

Best to start there, but as above this needs finding asap as that’s a good few litres of water at least being pumped into the fabric of your new home.
 

Fingers crossed that it’s finding its way to ground somehow, waters good at finding a way out, if one exists.