Help diagnose Ariston boiler fault

[chucklepie]

Hello,
I have a boiler engineer coming out, but it's not till next week, so I was just curious if anyone knew what this fault could be in case it was something obvious, it's the first I've tried heating since May...

Ariston Clas HE EVO38

No error messages, hot water is fine, but no heat. Even after putting the RF unit in override (however it is syncing ok and I can see the connection triggering to turn the relay on when I ask it), the boiler doesn't trigger.

However, if I hold the reset button and perform a 10 minute maximum heat test it works just fine. Pressure is 1.5bar and goes up over 2bar when it turns on as it's always been.

Any ideas?

Thanks.

 

[ShaunCorbs]

I’m guessing not a Combi Boiler if so is the port valve moving / opening ?

 

[chucklepie]

yes, it's a combi boiler.

 

[Deleted member 32524]

Link the live and switched live on the control stat wiring receiver. See if that fires it up. If so stat fault. If not then it's a boiler fault. Combi would needed opened up and looked at, need an engineer for that.

 

[chucklepie]

Ok, I opened the comb and bypassed the thermostat. Just as Duncan said, thanks

So, question is, this is a siemens rdj10f with a siemens rcr10 unit. What's the best way to determine which is at fault? I did press the 'override' button on the rcr10 unit and the relay light came on but no heat. Is it worth wiring the unit back in and moving the jumper to the rcr10 unit to see if that is the fault?

Thanks.

 

[Deleted member 32524]

It's a boiler fault. Need an engineer.

 

[chucklepie]

How's it a boiler fault? I disconnected the thermostat and put the jumper back on the boiler and it works fine, so isn't that simply the the thermostat at fault because it's just a N/O switch isn't it?

Thanks.