BAXI 105 HE FLAME FAILURE

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raynos

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HI IVE HAD NO HEATING OR HOT WATER FRO OVER A WEEK NOW.

FLAME FAILURE NEON FLASHES.

STARTS UP, IGNITES, ATTEMPTS FOR 10 SECONDS BEFORE ABORTING.
TRIES TWICE MORE BEFORE FAILING AND NEON FLASHES.

REPLACED PCB, MICROSWITCHES, GAS SENSORS, SELECTOR SWITCH COUPLE OF ISOTHERMS, FLUE STAT, WITH SAME RESULT EVERYTIME.

PRESSURE IS AT 1.5 NO PROBLEM PRIOR TO THIS.

PLEASE HELP ITS FREEZING!!!!
 
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Does it fire if you remove the white wire from the condensate trap.Lots of other reasons for your fault but this one is a start.
 
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Baxmax said:
Does it fire if you remove the white wire from the condensate trap.Lots of other reasons for your fault but this one is a start.
Click to expand...

Hi, thanks for question... I've just checked this...

it fires up, and tries for 10 seconds before failing after 2 more attempts. Basically the same fault if the wire was connected to the condensate trap.
 
Check and correct if necessary
1. Flame sensing electrode and lead connections
2. Electrode position
Flame current should be 1 μA approx.

Replace flame sensing electrode

If checks above are completed successfully, blockage
of the condensate drain or trap may have occurred
 
I had a problem with the ignition electrode ceramic insulation being cracked on the same boiler (I had only installed it 4 months previously.) So the spark never made it as far as the tip and hence no ignition.

I can't recall if you can see the electrode tips through the sight glass. If you can't, you should be able to remove the electrode cluster and see whether or not there is a spark present.

Hope this helps
 
steve32 said:
Check and correct if necessary
1. Flame sensing electrode and lead connections
2. Electrode position
Flame current should be 1 μA approx.

Replace flame sensing electrode

If checks above are completed successfully, blockage
of the condensate drain or trap may have occurred
Click to expand...

Thanks for replying..
Flame electrode has already been replaced, they are in the flame. All this work is being done by my plumber, but he's pretty stumped! Ordered a new lead, being fitted tomorrow... fingers crossed!!

Condensate trap is clear, checked and been washed out.
 
MarkRainbow said:
I had a problem with the ignition electrode ceramic insulation being cracked on the same boiler (I had only installed it 4 months previously.) So the spark never made it as far as the tip and hence no ignition.

I can't recall if you can see the electrode tips through the sight glass. If you can't, you should be able to remove the electrode cluster and see whether or not there is a spark present.

Hope this helps
Click to expand...

It is igniting, but its not registering, thanks for getting back.
 
have the Spark Electrode and Flame Sensing Electrode been replaced
 
Has tha aps been changed ? What is the dynamic working presure/ what is the burner pressure ? Is the polarity correct ?
 
steve32 said:
have the Spark Electrode and Flame Sensing Electrode been replaced
Click to expand...

Thanks for replying...
Flame sensor electrodes have been replaced, spark electrode hasn't yet... it is igniting, would this need replacing?
 
Baxmax said:
Has tha aps been changed ? What is the dynamic working presure/ what is the burner pressure ? Is the polarity correct ?
Click to expand...

Only sure what the aps is?
Polarity is correct,
apart from the system pressure being between 1.5 - 2, not sure of gas pressure.

The only part left to replace with a sensor is the gas value!?
 
i always replace both
as baxmax said check the aps and polarity

aps Air Pressure Switch
 
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