Problem with British Gas Boiler RD1

[beermatt3]

Good evening everyone, I desperately need some advice.

I have been called into have a look at a boiler a (british gas RD1) which as far as I can tell is basically the same as the Ideal Classic.

When you turn the boiler on led 3 and 4 come on for about a second than go to led 3 flashing, which a acording to instructions is a sensor fault.

So any suggestions which sensor, I have already replaced the board and has not made any difference.

At the moment I am £200 down (the cost of new board) and the boiler is still not working.

Any suggestions as always will be greatfuly received.

Thanks.

 

[Agile]

I think you need a competent boiler engineer who does not just change parts until it works.

 

[beermatt3]

I am a Corgi Engineer, have been for 20 years. I have followed instructions fault finding charts and made a judgment on what the results of the multi meter and my experience told me.

Do you think there is a chance I have been sold a faulty pcb?

I am sure I am not the only Engineer out there who has ever made a wrong diagnosis. I am not a cowboy, if I was I would have charged the customer for PCB and would be away on my horse by now, not trying to sort it out.

 

[geoff@cetltd]

I'm sure if you posted some useful information e.g. resistance of the sensor at RT, etc, it would be possible to point you more in the right dir3ection

When you say classic, are you talking about a 25b/c pcb ?

 

[Agile]

I did realise that you were CORGI registered!

If the diagnostic display suggested the sensors were faulty then I would have expected you to have measured the resistance of the sensors!

Instead you chose to change the PCB ! Why?

 

[ChrisR]

Which Ideal Classic has 4 led's??

 

[beermatt3]

Why are you being so aggressive, I am after help not more headaches.
Don't worry I will lay awake and work it out myself!!

 

[ChrisR]

Aggressive, moi? Is yours legs broke??

 

[Rob]

how comes you didnt try replacing thermistor to start with?

 

[ollski]

Air pressure switch?

 

[Rob]

Air pressure switch?

hi limit stat interupts APS from the Classic diagram

 

[geoff@cetltd]

Which Ideal Classic has 4 led's??

I presume he doesn't differentiate between neons and LEDs

and measures volts WRT earth ...

 

[corgiman]

I did realise that you were CORGI registered!

If the diagnostic display suggested the sensors were faulty then I would have expected you to have measured the resistance of the sensors!

Instead you chose to change the PCB ! Why?

oh come on tony we cant all be the all seeing eye can we, bet you have an orf day now and again

mind u OP he means well gawd bless him

 

[BDL]

Beermat,

You need to replace the thermister harness. It has blue and red wires, one goes to the heat exchanger pocket(top right and also to the fan). It comes as one complete harness.

The boiler is basically a classic chassis and heat exchanger, the pcb is not a 25 board. It was designed to allow British Gas to attach a modem and carry out remote diagnostics via their call centre. This never happened for one reason or another?

 

[Agile]

Any suggestions as always will be greatfuly received.

Thanks.

Some days are quite stressful but I would never fit a £200 pcb when the diagnostics indicate a £20 sensor!

Tony