Boiler Breakdown Sticky

[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

 

[Dan-HybridHeat]

Vaillant EcoTec Plus - if you fit an external expansion vessel make sure it goes on the return! Had a nightmare with one today, kept getting F75 (no pressure increase when pump spins). Eventually found out it was because I'd fitted the expansion vessel on the return - NEVER AGAIN!!

 

[abc_plumb]

You wanna read that again!
You're advising for a expansion vessel to be fitted on the return yet you had a nightmare when you fitted it on the return!!

 

[Dan-HybridHeat]

You wanna read that again!
You're advising for a expansion vessel to be fitted on the return yet you had a nightmare when you fitted it on the return!!

Originally fitted on FLOW - apologies!

 

[abc_plumb]

No worries, just didn't want anyone getting confused .

 

[stevetheplumber]

worcester junior hot water working but no heating check the minimum co2 runs ok on water as its nearly always running full flame

 

[erion]

Glowworm hxi model - when they turn off after being constantly in use they may show f5.
Overheat stat needs to be reset normally looks red and is located near the top left

 

[mikeyc]

Turned off and drained down an arriston microgenus to find on re filling and powering on the fan wouldn't spin.
Checked voltage to fan = nada, assumed PCB. Was about to go buy PCB before remembering the main circuit flow switch needs to make before your get fan/ignition.
Air in diaphragm - bleed pump = save your self a fortune and embarrassment.

 

[mikeyc]

Another one iv had a few of recently is a blocked condensate rubber tube on the greenstars (cubed trap not the bottle) - give it a squeeze and work it out. And of course wash it through with some water

 

[gileros]

Ariston Microgenus He fault code e34, MI's say APS not making. If the boiler fires up when you take the inner case off then you need to remove the restrictor ring in the flue. Spoke to a Ariston engineer on a product training day who told me to undo the flue elbow and remove the restrictor ring as it's not supposed to be there and it actually worked.

 

[PlumbersMate]

This is great!