Ideal logic gas valve

[newcastle phill]

No water in gas line ?

 

[anz]

Very unlikely, no way of checking for sure though is there.

 

[Elgordo]

A few more suggestions !!! Seal between fan and burner good?
Burner ceramic in good condition ?
Seal between burner and heat exchanger good?
Silicon seal at top of sliding pipe to flue good?

 

[anz]

All seals were good and burner looked fine,wgats this silicon seal?

 

[Elgordo]

Where the sliding vertical plastic pipe goes into flue bend , or am I thinking Intergas boiler . It sounds like it's either exces air is intermittently getting in or gas is being choked .

 

[anz]

Checked all seals, all good, changed the flue seal, changed injector washer, injector, cleaned venturi, cleaned burner, washed heat exchanger, checked condensate trap, replaced fan, tried new gas valve, gas pressure at boiler stays at constant 20 even when when noisy, so regulator ok..... I officially give up now, I'm lost on this one.

 

[GasmanxxxR1]

Did you change that washer on the gas valve to venturi union, even if it looks okay, change it. I used one of those green fibre washer 1/2"

 

[ambrosia]

stupid question, but dont those boilers have 7 year warranties, if it does cant be out of warranty yet

 

[anz]

Yep, changed the gas valve washers, it's not a plus so only had a two year warranty

 

[quality]

Have you changed the pcb ?

 

[anz]

No, not changed the pcb, why would it be the pcb?

 

[quality]

its the PCB that controls the fan speed and gas valve modulation which does seem to be the problem

 

[anz]

Agreed, I think it's the fan that's not pushing hard enough, because when you open the sump cover, it run fine.

 

[quality]

Its the only logical thing too suggest

 

[anz]

I've been thinking that but, it's not a cheap part... Are the logic pcb's same across the range? Except for the chip card.?

 

[quality]

I don't know if there the same but probably are. I would also check the fan connection as it is quite flimsy and although it plugs in there may be a faulty or weak contact/terminal

 

[Elgordo]

Board is the same for all models , the chip tells it which model it has to control so you only need buy board .

 

[buckley plumb]

Have you checked fan pwm (pulse width modulation) 1.5 to 2.7 vdc on x8 pin 4 yellow cable depending on fan speed

 

[anz]

So I replaced the pcb, fired boiler back up, fan sounded different (faster), boiler fired up, all good.. Had a look outside.. There was a beautiful plume coming out of the flue.. No noise... Analysed it all good.

Left heating on, called customer, told him that I'm confident that this has fixed it but I'll be back in touch in a couple of days to make sure... Then just as I was about to leave it started again!

 

[Elgordo]

Hate when that happens , it's a nightmare when you're caught between your pride telling you to stick with it and business sense telling you let someone else try it .One last try ... Check the gas valve coil for intermittent open circuit using an ammeter in series with feed ?

 

[AllyBongo]

Very frustrating by the sounds of it. Sounds like everything's been tried except for the wiring harness, as quality mentioned with the plug maybe having a loose terminal. We fit loads of Logic's, they look so easy to figure out as well. Suppose theres always something to throw us off, be very interested to know the outcome of this one

 

[buckley plumb]

I would of called ideal out on fixed price repair and saved all the cost and hassle

 

[ambrosia]

as long as when its sorted you come back and tell us.
love a good mystery

 

[newcastle phill]

Yeh as above