Dead boiler Vailant Ecotec Pro 28

[houstonwehaveaproblem]

Boiler dead this morning.

240v going in ok. Checked pcb fuse and ok.

not getting continuity across the pcb fuse holder though.

is this a duff pcb or something else?

UPDATE. Managed to get boiler back on but it cut out again after a couple of minutes. This time the pcb fuse has blown. Replaced fuse and this time it cut out. Fuse is fine though.

i unplugged the pump plug from the pcb and powered back up. Boiler power is staying on now. Is this poss a duff pump?

I have checked pump impeller moves freely which it does

got boiler to stabilise but when hot tap is turned on, boiler shuts down

 

[Jajodu]

With the boiler off remove the large slot head screw from the front of the pump, insert a screwdriver into the pump and see if it turns freely, it may be seized. You will get some water dribbling out so have a towel ready.

 

[houstonwehaveaproblem]

With the boiler off remove the large slot head screw from the front of the pump, insert a screwdriver into the pump and see if it turns freely, it may be seized. You will get some water dribbling out so have a towel ready.

Thanks. Checked that. It moves fine

 

[Jajodu]

You can wire the pump directly into a mains supply if you're confident with wiring to see if it works. Use a 5A fuse. You'll soon see if it blows the fuse. So not connected to the boiler electrically at all, just into a mains plug.

 

[houstonwehaveaproblem]

You can wire the pump directly into a mains supply if you're confident with wiring to see if it works. Use a 5A fuse. You'll soon see if it blows the fuse. So not connected to the boiler electrically at all, just into a mains plug.

Ok. I Can try that. So just remove the wiring in this box on top of the pump and connect some flex with a plug on. I have a 3amp fuse I can use

 

[houstonwehaveaproblem]

Ok. Bypassed the wiring and connected to mains supply. Pump is running fine. Usual hum you would expect

boiler is stable but shuts down when hot water or heating is demanded

 

[houstonwehaveaproblem]

No pilot light on either.

As soon as hot water is demanded boiler shuts down

If I demand heating. Something runs for about 15 secs then boiler shuts down

 

[muggles]

No pilot light on either.

As soon as hot water is demanded boiler shuts down

If I demand heating. Something runs for about 15 secs then boiler shuts down

Your boiler doesn't have a pilot light

 

[houstonwehaveaproblem]

Your boiler doesn't have a pilot light

ah sorry that would explain it!

 

[ianmcd]

Something runs for about 15 secs then boiler shuts down

Any error code

 

[houstonwehaveaproblem]

Any error code

no error codes.

If I press the live monitor buttons I get S.30 but I assume that’s because it’s stable and not asking for heat. If I turn on heating that code changes to S.02 then boiler shuts down after 10 seconds

normal codes

 

[Jajodu]

Have you reinstalled the pump. It won't run without it and will shutdown as soon as it detects a no flow situation.

 

[houstonwehaveaproblem]

Have you reinstalled the pump. It won't run without it and will shutdown as soon as it detects a no flow situation.

yeah re-connected after testing it.

 

[Jajodu]

In that case it should show an error code if it fails to run.

 

[houstonwehaveaproblem]

In that case it should show an error code if it fails to run.

no error codes