Options/recommendations for replacing failed Zappi

[NSS]

Hi all, long time no post, but I still loiter.

 

As the subject says, our Myenergi Zappi has failed (output failure error), irritatingly just 16 days out of warranty. They're offering to supply a recon unit "as a goodwill gesture" at a cost of £349 + VAT, but I'd have to arrange fitting myself. 

 

As those who remember me will know, electrics is a black art to me, so my questions are....

 

1) how easy would it be to swap out the old for new, ie does it need to be a specialist fitter or could any competent sparky do it?

 

2) should I be considering an alternative solution?

 

Thanks in advance for any advice 👍🏻 

[ProDave]

How old is it (what is the warranty period)

 

Replacing it with the same is the classic case of doing the same thing but hoping for a different result (the replacement lasts longer)  So I would not do that.  I would be asking this forum and others what alternative make has a proven record of lasting longer.

 

The fact they are offering you a refurb unit means they have been collecting dead ones and repairing them.  Personally I would be taking it apart to find out what has failed.

[NSS]

1 hour ago, ProDave said:

How old is it (what is the warranty period)

 

Replacing it with the same is the classic case of doing the same thing but hoping for a different result (the replacement lasts longer)  So I would not do that.  I would be asking this forum and others what alternative make has a proven record of lasting longer.

 

The fact they are offering you a refurb unit means they have been collecting dead ones and repairing them.  Personally I would be taking it apart to find out what has failed.

 

Hi Dave, how are you doing? The warranty was 3 years. The recon unit would be of the latest version, but I have similar concerns, hence my second question. 

 

I've spoken to the installer, who says he's come across this issue before and, in his experience, it's not something that can be easily (or economically) fixed. Online searches suggest it can sometimes be caused by a loose terminal or broken contactor, or a faulty relay, but I wouldn't have a clue what to look for, and even if I did I wouldn't have confidence in being able to safely dismantle and fix it.

[Mrog]

On 12/12/2025 at 13:38, NSS said:

Hi all, long time no post, but I still loiter.

 

As the subject says, our Myenergi Zappi has failed (output failure error), irritatingly just 16 days out of warranty. They're offering to supply a recon unit "as a goodwill gesture" at a cost of £349 + VAT, but I'd have to arrange fitting myself. 

 

As those who remember me will know, electrics is a black art to me, so my questions are....

 

1) how easy would it be to swap out the old for new, ie does it need to be a specialist fitter or could any competent sparky do it?

 

2) should I be considering an alternative solution?

 

Thanks in advance for any advice 👍🏻 

Hi, only just seen your post and you are likely to have sorted this by now, but for others benefit I had exactly the same issue. Output failure on a Zappi that was just out of warranty, with the same offer of a replacement. As an electronics engineer, I had a look at the unit and found there was one relay that was stuck. Replaced this with the same part (~£20 from RS) and no problems since. Perfectly doable for anybody who is comfortable with a multimeter and a soldering iron and safe electrical practices.

[Nickfromwales]

3 hours ago, Mrog said:

Hi, only just seen your post and you are likely to have sorted this by now, but for others benefit I had exactly the same issue. Output failure on a Zappi that was just out of warranty, with the same offer of a replacement. As an electronics engineer, I had a look at the unit and found there was one relay that was stuck. Replaced this with the same part (~£20 from RS) and no problems since. Perfectly doable for anybody who is comfortable with a multimeter and a soldering iron and safe electrical practices.

Thanks for this   Will be very helpful to anyone who is stuck with the same issue.

 

Any chance of an RS part number please? 

[NSS]

4 hours ago, Mrog said:

Hi, only just seen your post and you are likely to have sorted this by now, but for others benefit I had exactly the same issue. Output failure on a Zappi that was just out of warranty, with the same offer of a replacement. As an electronics engineer, I had a look at the unit and found there was one relay that was stuck. Replaced this with the same part (~£20 from RS) and no problems since. Perfectly doable for anybody who is comfortable with a multimeter and a soldering iron and safe electrical practices.

 

Thanks @Mrog, much appreciated. In the end, MyEnergi accepted that the issue was almost certainly a relay failure, and that it had been causing an intermittent fault for some while (probably since before tge warrant expired). As a 'goodwill gesture' they replaced it FOC, albeit with a refurbished unit, and our original installer agreed to install it for a modest fee. Happy days!

 

To my surprise, MyEnergi did not ask for the old one to be sent back. I have a sparky mate who's going to have a look at it when he has a spare moment, and if it proves to be a cheap fix then I'll probably keep it as a spare.