Outside temperature sensor - weather compensation. Viessmann

[leviathan123]

Morning all
Viessmann Vitodens 200-W 35kW combi
Outside temp sensor probably failed with boiler reporting incorrect temps. Corrosion on Thermistor.
To replace the sensor, does it have to be the exact model showing on the manufacturer’s website, or would a slightly older (but same spec) sensor - probably for older boilers in the same range, work ok?
Asking because new sensor showing as over £100 and as far as I can see, all that’s in the small plastic case is a tiny PCB, a 10 kiloOhm Thermistor and a double connector block.
I’ve found several sensors on line - all quoting 10 kiloOhm NTC but can’t confirm they’re the current model for my boiler.
Would all 10kiloOhm temp sensors do the same job or is there something on the PCB which makes them boiler specific?
Thanks

 

[ShaunCorbs]

Yes just a 10k sensor nothing special

 

[Chuck]

The service manuals for Viessmann boilers include a graph of R vs T for the weather sensor so you can cross-check against the spec sheet for whichever one you plan to buy.

 

[leviathan123]

Yes just a 10k sensor nothing special

Thanks for the reply.
So any Viessmann outdoor sensor - providing it is 10 kiloOhm NTC - should work fine?
I think what’s happening is that our boiler (7/8 years old) is no longer a current version and so spares for it are not as plentiful as for newer boilers in the range. Hence the higher sensor price (£102).
Replacement sensors for the current boilers are available around the £30 mark and before assuming they’d work with my older boiler (both boilers are Vitodens 200-W, just different ref. numbers) I thought it best to check that there is nothing within the sensor which would prevent it from working with my older boiler.
When the sensor cover is removed, it just looks to be a small PCB, one Thermistor and a double connector block to take the DC cable. Doesn’t look overly complicated assuming nothing ‘hidden’ on the PCB.
Thanks again.

 

[ShaunCorbs]

Outside Temperature Sensor NTC 10 kOhm

Outside Temperature Sensor B2HE/B2KE

viessmanndirect.co.uk