Will overvoltage damage circuit boards? (Ed.)

[BadVoltage]

If someone inadvertently sent 240v to the 24v RT connections on their Vaillant ecoTec pro 28 boiler and happened to blow the 3A fuse, what are the chances the boiler's completely bu****ed?

Anyone that can stop laughing long enough to answer would be appreciated.

Thanks in advance.

 

[bernardgreen]

I can't answer for the Vaillant ecoTec pro 28 boiler but I have seen a lot of equipment ( indudtrial and domestic ) that has protection designed in.

Protection that can "tolerate" overvoltages to be applied without allowing the overvoltage to cause significant damage to the equipment

 

[Harry Bloomfield]

happened to blow the 3A fuse, what are the chances the boiler's completely bu****ed?

For the cost of a few pence, for a fuse, you could find out.. Then let us know..

 

[Jurassicspark]

A fuse won't blow under a higher applied voltage scenario.

Any reputable supplier should have some sort of circuitry to prevent over voltages. This can be easily done with a TVS diode or similar.

 

[bernardgreen]

This can be easily done with a TVS diode or similar.

which should be designed to be able to carry enough current for long enough to blow the fuse before the device fails.

 

[RandomGrinch]

If it is anything like this Glow Worm Ultracom, then the outcome won't be good - new PCB time...

Hive Mini & Blown Boiler PCB

Hi All I'm looking for some help. I've had a gas engineer around to fit a Hive Mini Thermostat (product no. 852033) onto my Glow Worm Ultracom 2 24cxi boiler (GC 47-019-10). Unfortunately the PCB blew after the first attempt. This was put down to the PCB being old. So new PCD purchased and it...

www.diynot.com

Vokera boilers also don't appreciate the extra voltage...

 

[Stuckinarut]

Won’t know unless you try, but could be new pcb as above

 

[BadVoltage]

For the cost of a few pence, for a fuse, you could find out.. Then let us know..

The fuse has been changed and is new.

No joy.

 

[BadVoltage]

A fuse won't blow under a higher applied voltage scenario.

Any reputable supplier should have some sort of circuitry to prevent over voltages. This can be easily done with a TVS diode or similar.

The voltage was applied after the fuse.

 

[BadVoltage]

I can't answer for the Vaillant ecoTec pro 28 boiler but I have seen a lot of equipment ( indudtrial and domestic ) that has protection designed in.

Protection that can "tolerate" overvoltages to be applied without allowing the overvoltage to cause significant damage to the equipment

That's what I'm hoping. Mainly because I do know that there is a 230v RT connection and I'm hoping I can just wire to that instead of the blown 12v RT.

 

[BadVoltage]

If someone inadvertently sent 240v to the 24v RT connections on their Vaillant ecoTec pro 28 boiler and happened to blow the 3A fuse, what are the chances the boiler's completely bu****ed?

Anyone that can stop laughing long enough to answer would be appreciated.

Thanks in advance.

The 12v RT is on the top left of the PCB, 240v is on the top right.

Just to add, there is no sign of scorching, smoke, etc on the front or back of the PCB but there is the smell of burnt plastics/electronics.

 

[BadVoltage]

If it is anything like this Glow Worm Ultracom, then the outcome won't be good - new PCB time...

View attachment 365988

Hive Mini & Blown Boiler PCB

Hi All I'm looking for some help. I've had a gas engineer around to fit a Hive Mini Thermostat (product no. 852033) onto my Glow Worm Ultracom 2 24cxi boiler (GC 47-019-10). Unfortunately the PCB blew after the first attempt. This was put down to the PCB being old. So new PCD purchased and it...

www.diynot.com

Vokera boilers also don't appreciate the extra voltage...

View attachment 365989

There's no sign of burning, scorching, or smoke.

But there is the smell I would associate with that.

 

[Harry Bloomfield]

That's what I'm hoping. Mainly because I do know that there is a 230v RT connection and I'm hoping I can just wire to that instead of the blown 12v RT.

Does the LCD display come on, when the boiler is powered?

 

[BadVoltage]

Does the LCD display come on, when the boiler is powered?

Nope.

 

[Harry Bloomfield]

Nope.

Time for a new PCB then..