Modena 80E random heating problem

[Harris500]

Hello everyone,

I have this 8 year old combi boiler installed in our flat. The problem is that regardless of the timer and the temp dial to 0, the boiler ignites and the raditor lights comes on and then goes off after after few minutes, without anyone using the tap! In the timer, the heating is disabled.

A local plumber told me it could be due to two reasons:

A) Faulty sensor, which thinks it's too cold and initiates heating disregarding the timer. He tells me that sensors comes in pairs for £20

B) Faulty Timer.

Not sure if he is telling the truth or not or just trying rip me off. I'm relying on you people who have some expertise, to advise me.

It's so annoying that sometime we switch it off, as it comes on randomly day and night.

Thanks very much.

 

[wnjswozo]

sounds about right,not the best boilers in the world

 

[Billy Bob Bob]

if the timers strapped out you have a faulty thermistor,as your gsr says change both but he could easily prove if it was the timer by linking both black wires and soak testing the timer

 

[Harris500]

Thanks Guys for the replies.

So you're saying it could be both not just either of them. Is the thermister same as the sensor?

Thanks.

 

[Billy Bob Bob]

Thanks Guys for the replies.

So you're saying it could be both not just either of them. Is the thermister same as the sensor?

Thanks.

yes thermistor,ntc,sensor all the same thing its likely just ch one gone but makes sense to do both as they are so problematic on the ferroli

 

[alexbw]

Let me know how you get on. I've got exactly the same problem with exactly the same boiler. Only noticed it since I've tried to shut the heating off in the last couple of weeks. It's doing my nut in!

 

[Mbear]

Replace both sensors, that'll sort it