Dead boiler Vailant Ecotec Pro 28

[Jajodu]

So if you observe the led panel using the i button what sequence do you get please. Do you have the install instructions? It lists all the S codes to explain their meaning.

 

[houstonwehaveaproblem]

So if you observe the led panel using the i button what sequence do you get please. Do you have the install instructions? It lists all the S codes to explain their meaning.

S.30 code

Room thermostat is blocking heating mode

I have a Hive wireless stat connected to the boiler

 

[Jajodu]

Then it's external, S30 is no request for heat.

 

[houstonwehaveaproblem]

Then it's external, S30 is no request for heat.

i bypassed the hive by fitting the link wire back in the boiler. Same problem

 

[Jajodu]

Post a picture of the wiring into the boiler please. If you bridge 3&4 does the boiler fire up, if not measure the voltage on both with a multimeter, one probe on the negative in, the the other on either 3 or 4, what doe you get? You need to see 240 V on at least one of them

 

[houstonwehaveaproblem]

If I bridge 3 & 4 the pre heat starts then boiler shuts down. Getting a flash of light off the pcb too I noticed

 

[houstonwehaveaproblem]

Bridge removed. Tested voltage at Neutral and the RT terminal 4.
24v present.

nothing at the 24v terminal 3 & neutral

 

[houstonwehaveaproblem]

Even with hive disconnected at the boiler and boiler reset it still has a S.30 code when using the buttons to view

 

[Jajodu]

Bridge removed. Tested voltage at Neutral and the RT terminal 4.
24v present.

nothing at the 24v terminal 3 & neutral

You should have 240v not 24 on those terminals. Don't like the flash on the pcb though

 

[houstonwehaveaproblem]

Even with hive disconnected at the boiler and boiler reset it still has a S.30 code when using the buttons to view

You should have 240v not 24 on those terminals. Don't like the flash on the pcb though

Definitely getting 24v between neutral & RT terminal not 240v

sorry flash may have been incorrect. Poss. The resettable fuses .

 

[houstonwehaveaproblem]

The boiler has both 24v & 230v RT connections.

 

[Jajodu]

Which connection are your external controls connected to?

 

[houstonwehaveaproblem]

Which connection are your external controls connected to?

the 24v ones. Via the hive control unit.

 

[Jajodu]

So if you disconnect these wires from the hive and jumper the two pins on the 24v rt connections the boiler doesnt fire up?

 

[houstonwehaveaproblem]

So if you disconnect these wires from the hive and jumper the two pins on the 24v rt connections the boiler doesnt fire up?

If I fit the link wire between 24 & RT something starts to run for about ten seconds but it’s not the boiler firing. But then then the boiler shuts down