Vaillant ecotec 618 s30 error

[frozen123]

Hi we have the s30 status code showing which I think means no send for heating from external controllers. We have a wired honeywell thermostat and 2 channel programmer. I have replaced both, and the PCB and the water sensor has been replaced. We fitted a new pump last year and that seems fine still. The boiler produces hot water and until I changed the water sensor the rads would get slightly warm when hot water was on, now always stone cold. I have reset the PCB to factory still s30 code but heating symbol does come on boiler display. Originally I thought perhaps it was a diverter valve but have been told the 618 is a system boiler not a combi and doesn't have a diverter valve (not sure if correct) Any ideas of what I can try please?

 

[cross thread]

Have you a cylinder and external zone valves

 

[frozen123]

Hi, we have a hot water cylinder upstairs, but not sure what external zone valves are?

 

[cross thread]

post a photo of the cylinder and any controls / valves

 

[frozen123]

Hi will take a pic, just wanted to add, changed d70 setting to 3 heating only and now rads are on in one room only despite trv on in each room

 

[CBW]

Hi will take a pic, just wanted to add, changed d70 setting to 3 heating only and now rads are on in one room only despite trv on in each room

So, since the change, has the S30 now disappeared?

 

[frozen123]

Yeah now shows S4 normal burner operation but only one rad is hot, closest one to cylinder

 

[CBW]

Yeah now shows S4 normal burner operation but only one rad is hot, closest one to cylinder

Just looked at photo, you have a 3 port valve. If just the heating is on and the hot water off or has been off a considerable amount of time, check the feed going to the cylinder, if hot then likely a failed valve.

 

[cross thread]

Photo 3 is a 3 port y plan valve, when only heating on the small lever sho have no resistance if you try to move it.

 

[frozen123]

Hi so the hot water has been on normally, and the heating off, and has been off since last winter so possibly valve has failed or stuck?

 

[cross thread]

do you have a room thermostat ? is it turned up

 

[frozen123]

Can I try and move it with electric on?

 

[frozen123]

Yes thermostat on max. This is current position of 3 port valve

 

[cross thread]

Has it any resistance or “floppy “

 

[frozen123]

No resistance at all with power off