Worcester Greenstar fault or possibly not

[bigduke]

Hello,
Hope that somebody can help. My brother has just fitted a brand new Greenstar gas combi. The electrician had removed the factory fitted bridge wire on the control board and connected up the thermostat. Unfortunately he had caused a short circuit and it blew the 2.5A fuse on the control board. when it was pwered up.The bridge was refitted and a new fuse fitted but the central heating will only operate if the maintenace button is pressed. DHW is not affected and works normally. My fear is that the PCB may be damaged but I'm not really sure. The boiler was just given a short run to check it's operation prior to a corgi plumber carrying out final commissioning.
Cheers

 

[Agile]

A CORGI registered person can commission a boiler that he has not fitted.

However he cannot notify the installation to CORGI ( and thence Building Control ) if he has not fitted the critical aspects himself.

The external controls on the Worcester are designed for low voltage only and it sounds as if this electrician has applied mains voltage and damaged the boiler PCB.

Since the owner expects any electrician to be competent to undertake the work then its clearly his responsibility to pay for the replacement of the PCB.

Worcester are very supportive of gas installers and if you call them under the warranty its always possible that they will replace it free of charge although in the circumstances it should be chargeable.

In future use a better electrician!

Tony

 

[simond]

The ST10 connections in a Greenstar current model combi are 240v and have a live in, live out (linked when the boiler comes out of the box) and a neutral.

In all probability your electrician has connected the neutral to the thermostat wrongly, electronic ones are particularly easy to do this with, if you are careless. So a new PCB is on the cards. Your brother has already cost you more than getting the boiler professionally installed.

Agile's comments regarding the commissioning are spot on and are often repeated on this forum. The boiler fitting, flue connections and gas pipework are not allowed to be externally visually inspected if it is a new installation carried out by non qualified personnel.

In essence it all has to be dismantled and reassembled by the commissioning person and if this is not done, the CORGi registered person risks their livelihood if they sign it off.

The water bearing pipework can be done by anyone, although the value of your property could be significantly diminished if the job looks like a DIYer did it. We see some DIY jobs that are excellent, others .......well, 80% of them you can spot standing on the doormat.

 

[pannierstan]

The external controls on the Worcester are designed for low voltage only and it sounds as if this electrician has applied mains voltage and damaged the boiler PCB.


Tony

They are actually 240v me thinks Agile

 

[Agile]

I thought the Greenstar 12RI which I fitted a stat to a few weeks ago was warning LV two wire connection only.

But perhaps I was mistaken or perhaps it was only warning that it should be a two wire connection meaning that 240 should not be injected from another source to constitute a safety hazard.

Regardless of what the connections are, it seems clear that the electrician has messed up the PCB probably because he could not bother to read ( or understand ) the instructions.

There are too many people who think you have to apply an external 240v call for heat to every boiler regardless of what warning labels say.

Tony