seeking experienced advise on an intermittent fault on ideal logic combi?

[farrellyheating]

Mines a c30 plus.
Kept having peculiar things happening to it.
It was under warranty only 2 years old.
I installed.
So I got ideal out turns out the thermisters where dropping in and out between swichnover.
To fast to notice had to be plugged in to show when it dropped out . It was that fast enough to confuse the boiler.
[automerge]1574504952[/automerge]
New thermisters been ok since
Might help
not to expensive to change either
[automerge]1574505112[/automerge]
Mine also played up when running the boys bath.

Cheers for the advice. My issue only occurs when there is a demand for HW when the boiler is off? Do you reckon thermistors would be the first change?

 

[Scott_D]

Whats your inlet pressure?
Spark generators are quite a common part to fail
Gas Valve
Meter regulator?

 

[farrellyheating]

Whats your inlet pressure?
Spark generators are quite a common part to fail
Gas Valve
Meter regulator?

I was thinking if it was the spark generator I'd be getting a lock out on CH as well but I never do. I was thinking gas valve or fan as these are modulating on HW demand but I'm not sure. Inlet pressure is 19.5.

 

[Scott_D]

I was thinking if it was the spark generator I'd be getting a lock out on CH as well but I never do. I was thinking gas valve or fan as these are modulating on HW demand but I'm not sure. Inlet pressure is 19.5.

Is that at max rate?
Does it dip at all on initial fire up?

 

[garygvl]

when you did the full service what did you test

 

[farrellyheating]

Is that at max rate?
Does it dip at all on initial fire up?

Yes max rate and no dip that I noticed.
[automerge]1574590809[/automerge]

when you did the full service what did you test

Vessel pressure, inlet pressure, working pressure, gas rate, combustion.

 

[Scott_D]

Cleaning the brass Venturi
Washing through the heat exchanger
Checking spark gap
Cleaning the condense trap and rubber hose are part of Ideals ‘full service’

 

[farrellyheating]

Cleaning the brass Venturi
Washing through the heat exchanger
Checking spark gap
Cleaning the condense trap and rubber hose are part of Ideals ‘full service’

Yes. All done. All advised by Ideal tech support but had an ignition lock out a week later. Reset and everything is fine for a week or two then it reoccurs.

 

[garygvl]

need to check flame current on ignition