Urgent MVHR help needed

[vivienz]

We had a brief power cut this evening with everything shutting down for about 5 minutes. Most things are fine but the MVHR won't come back on and appears to have dropped its link with the control pad. I've attached a photo of the messages on the pad.

I have no idea how to re-establish this and the house is rather uncomfortable without it running.

Can anyone help, please?

[Ed Davies]

Not being sarcastic: have you tried turning it off and on again? Maybe there was a glitch as the power came back on which borked one or other end which would be reset by turning it on with the power in a stable state.

[vivienz]

None taken, Ed, but yes I did try that both at the control pad and the power switch to the main unit itself. I will give it another try - it won't make it any worse.

[vivienz]

Okay, it did make it worse. The main unit is now giving out a high pitched alarm signal whistle. I've switched it off again.

Update: and on again. Alarm gone but still not talking to the control pad.

Edited November 14, 2019 by vivienz
update

[MikeSharp01]

Has it got / is there a flat backup battery somewhere and its lost its settings?

[vivienz]

I'm not aware of any battery in the main unit. The control pad is still on.

Edited November 14, 2019 by vivienz

[MikeSharp01]

Has the main unit got a reset button / switch hidden behind a tiny hole somewhere. Although looking at the message it implies that some communication blockage has occured there are no switches (network) anywhere in the system - is the panel wired direct to the main unit?

[vivienz]

Yes, the control pad is hardwired to the unit. Without taking off the internal panel covering the electronics of the main unit, I can't say whether there is a reset button. I don't want to mess with anything inside it as I have no idea what I would be doing.

[vivienz]

The control pad has a user and maintenance interface but I can'tdo anything with these as i have never been given the logins.

[MikeSharp01]

Just now, vivienz said:

Without taking off the internal panel covering the electronics of the main unit, I can't say whether there is a reset button. I don't want to mess with anything inside it as I have no idea what I would be doing.

No Best leave it unless there is a clear reset button on the outside.

[MikeSharp01]

Try leaving it off for a longer period, couple of minutes, just in case some residual voltage is lurking about in some capacitor in there.

[vivienz]

Okay, will go and switch off again and leave it for a while. Thanks, Mike.

 

[Ed Davies]

1 minute ago, MikeSharp01 said:

Try leaving it off for a longer period, couple of minutes, just in case some residual voltage is lurking about in some capacitor in there.

 

Good idea. Probably worth doing that at both ends together.

[vivienz]

Okay, I've switched it off at the RCD and that has cut the power to thr control pad as well. I will give it long enough for a small glass of red wine then try it all again. Thanks, chaps.

[JFDIY]

Think I'd turn it off for half an hour or more, if it faulted on the original 5 minute interlude it perhaps would benefit for longer

[vivienz]

11 minutes ago, JFDIY said:

Think I'd turn it off for half an hour or more, if it faulted on the original 5 minute interlude it perhaps would benefit for longer

 

A slightly less small glass of wine, then.

[Pocster]

9 minutes ago, vivienz said:

 

A slightly less small glass of wine, then.

A big glass required! ? fixes everything!!

[Bitpipe]

52 minutes ago, Ed Davies said:

Not being sarcastic: have you tried turning it off and on again? 

 

You are a highly paid IT consultant and I claim my £5. Either that or you've watched too much IT Crowd

[vivienz]

8 minutes ago, pocster said:

A big glass required! ? fixes everything!!

 

Not with all that up and down into the loft! I've already had 1 broken ankle in the last couple of years and don't want that again!

[vivienz]

I've switched back on but there's still no change with the control pad display and it's not talking to the main unit.

I will call the manufacturer tomorrow and see if they can help.

[PeterW]

Looks like the power trip has spiked the main board - was this weather related (power outage)..?

[Onoff]

Should you lot with ASHPs not be considering fitting SPDs (surge protection devices) from the off to protect all that delicate, expensive electronic gubbins?

 

What's is going to cost, £70?

 

Hager Guide to Surge Protection.pdf

 

I've a couple of dead fax machines here that suggest I should! ?

 

 

[Pocster]

1 minute ago, Onoff said:

Should you lot with ASHPs not be considering fitting SPDs (surge protection devices) from the off to protect all that delicate, expensive electronic gubbins?

 

What's is going to cost, £70?

 

Hager Guide to Surge Protection.pdf 2.29 MB · 0 downloads

 

I've a couple of dead fax machines here that suggest I should! ?

 

 

What’s a fax machine?

[ProDave]

1 minute ago, Onoff said:

Should you lot with ASHPs not be considering fitting SPDs (surge protection devices) from the off to protect all that delicate, expensive electronic gubbins?

 

What's is going to cost, £70?

 

Hager Guide to Surge Protection.pdf 2.29 MB · 0 downloads

 

I've a couple of dead fax machines here that suggest I should! ?

 

 

Not all mvhr units are over complicated with computers and communication protocols.  Mine is basically a 4 speed fan, with volt free contacts to select the speed, and simple timer and relay logic for selecting boost speed.

[Simplysimon]

3 minutes ago, pocster said:

What’s a fax machine?

it was the successor to the clay tablet, don't you read history?