Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 17 replies
  • Subscribers 32 subscribers
  • Views 3200 views
  • Users 0 members are here
Options
You may also be interested in
This discussion is locked.
You cannot post a reply to this discussion. If you have a question start a new discussion

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.

Parents
  • 0

    Good for you. Many folk would have scrapped it for the sake of a part costing less than a pint. Of course the value of the time to fix is another matter, but it is yours.

    you may also have seen an open cct accross the coil terminals vs a few hundred ohms, if it was an open winding. Equally the winding may be intact, and the mechanics of the contact rockers have rubbed though at the bearings after thousands of operations.

    for relays of an age, in my experience of such things, the corrosion to open circuit of the coil windings  - which use surprisingly thin wire-  seems to race mechanical failure of the contact rocker. Corrosion wins in the cold and damp, but mechanical wear out for things that click a  lot in dry dusty places.

     

    Mike.

     

Reply
  • 0

    Good for you. Many folk would have scrapped it for the sake of a part costing less than a pint. Of course the value of the time to fix is another matter, but it is yours.

    you may also have seen an open cct accross the coil terminals vs a few hundred ohms, if it was an open winding. Equally the winding may be intact, and the mechanics of the contact rockers have rubbed though at the bearings after thousands of operations.

    for relays of an age, in my experience of such things, the corrosion to open circuit of the coil windings  - which use surprisingly thin wire-  seems to race mechanical failure of the contact rocker. Corrosion wins in the cold and damp, but mechanical wear out for things that click a  lot in dry dusty places.

     

    Mike.

     

Children
No Data

Join us to get the best from IET EngX.

Joining EngX lets you personalise your experience so you stay up to date on the topics that interest you, plus you’ll be able to make connections who are looking to collaborate, exchange ideas and more.

Join us Not now

Community Rules & Guidelines