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Just for information BAXI 105E

whjohnson

Been fault finding on my old combi and having solved the problem I would like to share the solution with those who are still running the old Baxi Water Hotter!

Model of boiler is BAXI 105E combi - Not a condensing combi. This model is around 20 years old.

Nature of fault - No hot water, fan failure fault light on, and flame failure fault light on.

I initially changed the complete diverter valve assembly because the original one was leaking and badly corroded, although this was not actually causing the fault.

I traced the fault to a relay on the pcb which actuates the fan. For information, the relay is marked RL.1

This applies to a Honeywell pcb with the following markings printed on it -

CE 00518L 1810

CS0118E-LS

TYPE:MIDINT00

CD 995099 2

CD 565599 2 

I sourced a replacement relay from ebay, in fact I bought 2, since there are 2 identical relays on the pcb so I got a spare.

Relay part no details - 

TAKAMISAWA JV24S-KT

5A 30VDC

250VAC

SPST

Coil voltage is 30VDC, cantact voltage rating is 250VAC

I unsoldered the original relay and connected 30VDC across the coil and a multi-meter set to ohms across the contacts - result was open circuit.

I repeated the process with the new relay and got continuity across the contacts and a satisfactory click as the coil energised.

I had a spare pcb but that didn't work at all when I just did a straight swap. Anyway I hope someone finds this info useful.

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    I read this thread with interest.  My Vaillant boiler (coming up for 10 years old) has had a couple of intermittent lockouts with an F62 fault.  The book says this is a gas valve fault, but further research shows it's also caused by a PCB fault, and if the temperature display jumps about (which mine does) then it's a PCB fault.

    I suspect it's likely to be a dry joint or a power supply component that's failing.  Not sure I can be bothered to trace it so I have bought a replacement online (brand new, Vaillant original, around £100) and will fit it this weekend.

    I was a bit nervous about the Gas Safe ‘legalities’ but I won't be going near the gas systems.  I may get the current settings off the existing board so if anything is not factory default then I can replicate it and all should hopefully be good.

    Some of the online ‘advice' for this fault is terrible! E.g. ‘A new PCB will be more than £500 + fitting +VAT, so you may as well replace the boiler'.  All sorts of ‘call a registered engineer and be prepared for a bill’ stuff as well.

    I consider myself competent to do a PCB replacement, provided it doesn't cause all the settings to go out, but if it does then I'll just need to get the ‘service’ done a bit early - it's due next month anyway.

    Jason.

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  • 0

    I read this thread with interest.  My Vaillant boiler (coming up for 10 years old) has had a couple of intermittent lockouts with an F62 fault.  The book says this is a gas valve fault, but further research shows it's also caused by a PCB fault, and if the temperature display jumps about (which mine does) then it's a PCB fault.

    I suspect it's likely to be a dry joint or a power supply component that's failing.  Not sure I can be bothered to trace it so I have bought a replacement online (brand new, Vaillant original, around £100) and will fit it this weekend.

    I was a bit nervous about the Gas Safe ‘legalities’ but I won't be going near the gas systems.  I may get the current settings off the existing board so if anything is not factory default then I can replicate it and all should hopefully be good.

    Some of the online ‘advice' for this fault is terrible! E.g. ‘A new PCB will be more than £500 + fitting +VAT, so you may as well replace the boiler'.  All sorts of ‘call a registered engineer and be prepared for a bill’ stuff as well.

    I consider myself competent to do a PCB replacement, provided it doesn't cause all the settings to go out, but if it does then I'll just need to get the ‘service’ done a bit early - it's due next month anyway.

    Jason.

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