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Just for information BAXI 105E

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.

Parents

0 mapj1 over 3 years ago

I can hear plumbers all over the land shouting “What are you doing? Boilers are the preserve of the Gas Safe Cartel!”
And, if you had charged a customer for doing gas work, they would be correct to do so. However, even if you had opened the flue or a gas-way, working for free, and on your own equipment no less, the only legal compulsion is to be competent, not to be a member of a register of competent persons or to hold any particular city and guilds results.. Now of course if you break something, or in the limit gas yourself or burn your eyebrows off, then perhaps you were not competent, and as well as needing it sorting out suddenly it becomes illegal as well, but clearly this is not the case today.
As you call it a cartel, actually it is quite informative to compare the rates of gas accidents in the decade before and after the introduction of compulsory Corgi registration, as it was called when it came in in 1992. (Corgi set off as a non-statutory trade body in 1970) Rather like part P, it cost quite a lot of money and had no great effect on the overall accident trends.
Mike.
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0 mapj1 over 3 years ago

I can hear plumbers all over the land shouting “What are you doing? Boilers are the preserve of the Gas Safe Cartel!”
And, if you had charged a customer for doing gas work, they would be correct to do so. However, even if you had opened the flue or a gas-way, working for free, and on your own equipment no less, the only legal compulsion is to be competent, not to be a member of a register of competent persons or to hold any particular city and guilds results.. Now of course if you break something, or in the limit gas yourself or burn your eyebrows off, then perhaps you were not competent, and as well as needing it sorting out suddenly it becomes illegal as well, but clearly this is not the case today.
As you call it a cartel, actually it is quite informative to compare the rates of gas accidents in the decade before and after the introduction of compulsory Corgi registration, as it was called when it came in in 1992. (Corgi set off as a non-statutory trade body in 1970) Rather like part P, it cost quite a lot of money and had no great effect on the overall accident trends.
Mike.
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Just for information BAXI 105E

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