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.