Boiler Breakdown Sticky

[dave1]

Biasi M96(24/28)SM/C2
Round black APS
boiler fires up for a few seconds then goes off, continues to spark. After a few attempts the lock out led comes on. Works when the combustion chamber is off.

check flue was fitted correctly as the white seal bends when pushing the elbow into the flue and doesn't sit right.
Fault only starts after the warrenty period is over
Remove the complete flue clean and pour water in the top of the boiler to clean out the heat exchanger. Done 3 of these in the past year.

Got one of these that displays aps fault mostly in ch mode. New aps fitted already, I'm going too go back and check flue and Venturi. Any other ideas?

 

[TFGplumbing]

Worcester Greenstar 28i Jr

If your customer is getting below/above average heat on the DHW hold fire on the PHE for a second & get out your thermometer & multimeter.

Check the resistance on the DHW NTC, for example I had a GS 28i JR that was not getting past 40C @ the DHW outlet the Kohms reading was out by 0.5

10C - 19.9 Kohms
20C - 12.3 Kohms
30C - 7.9 Kohms
40C - 5.2 Kohms
50C - 3.5 Kohms
60C - 2.4 Kohms
70C - 1.7 Kohms

 

[Geyser]

And check the diverter head hasn't been hanging off for three years since install(by someone else) and sending heat around rads everytime hot tap turned on. I was checking thermistors when valve head droped off.

 

[Captain.rick]

This is great stuff especially for newbies like me, thanks guys

 

[bright spark]

Here's 1 for commercial oil burners. I'd say Croppie's seen this. Have seen this happen a couple of times on Riello RL burners.
If the plant room door is open on a sunny day, sun shining in can make d burner go to lock out.
Photocell can pick up light shinning down boiler sight glass, say when boilers up to temperature, photocell picks up some light, the panel thinks there's a flame like a big lump of carbon on d head burning, and locks panel out.
You'll go out on call, Murphy's law it'll be a dull day and there'll b no apparent fault.

 

[Dotty]

Here's 1 for commercial oil burners. I'd say Croppie's seen this. Have seen this happen a couple of times on Riello RL burners.
If the plant room door is open on a sunny day, sun shining in can make d burner go to lock out.
Photocell can pick up light shinning down boiler sight glass, say when boilers up to temperature, photocell picks up some light, the panel thinks there's a flame like a big lump of carbon on d head burning, and locks panel out.
You'll go out on call, Murphy's law it'll be a dull day and there'll b no apparent fault.

Don't it throw you! Bit of insulating tape, job done.

 

[Ollieg]

Vaillant ecoTecs

If you have random unrelated intermittent faults.
Get a cuppa turn it on heating and watch the display. If the boiler flow temperature jumps around from say 55 to 62 and back in the blink of an eye the PCB needs replacing. It can take 5-10 min to start doing this.

Video on next post.

 

[Ollieg]

[DLMURL]https://vimeo.com/142146807[/DLMURL]
Here's a video.
It can be more subtle than this.

 

[gmartine]

Is it worth splitting this thread into separate manufacturers?

 

[Super Mario]

Yes too many diff models