Boiler servicing process.

[London Gas]

Evening boys and girls,


There have been posts like this before I'm sure but I am curious as to what others are doing when servicing boilers more so when working on ones with pre-mix gas valves as I feel I am either doing what we was taught in college or I'm missing a trick or two somewhere... I often when taking on new customers look over any previous paperwork they have just to see what has been done, check if boilers with common faults or safety issues have been repaired or not (such as flue collectors on vaillants/glow worm) and check previous readings etc. A few jobs I have been to recently have been in a really bad way, two were Worcesters with perfect readings but gunked up heat exchangers and poor fan pressure readings out of scope, this makes me assume that people are just straight away adjusting the ratios if their CO2 is out or any other readings which personally I find can be dangerous and a poor service, just wanted to see what others felt regarding this and if you adjust these valves before checking the burner/heat exchangers? (Granted manufactures instructions typically cover this)

Do you guys do basic services for low prices checking the appliance for safety and correct operation and then charge more for a full strip and clean with new seals?

 

[ShaunCorbs]

every 4 years a full strip and clean / replace burner gasket etc also the normal yearly (normally allow half a day)

every other eg 1,2 and 3 etc (yearly)

check expansion vessel,
tightness test gas system,
clean maggy and top up with fresh inhby,
bleed rads,
check system pressure and top up,
check system controls are working,
clean condense trap and refill,
clean condense pump if there is one and check operation
gas rate system,
fga boiler

(normally allow 1.5-2 hours)

 

[London Gas]

That's what we should all hopefully be doing, I wish I had half a day to be able to service a boiler that sounds like the life to be living!

The issue I have or question I have if you went out there a second year and your CO2 was .1%/.2% out but still with a good ratio would you adjust it in, or carry out further checks, from what I am seeing or hearing people just tweak these valves and I personally think unless there's an issue these values should stay within scope from when set (if done so correctly)

 

[ShaunCorbs]

Depends

If ratio, o2 and ppm were the same I wouldn't adjust

 

[London Gas]

Even if the CO2 was out of the scope? Would that not class as the boiler not operating to manufactures instructions and whilst servicing require further investigation?

 

[ShaunCorbs]

They normally give you a tolerance of a few percent

 

[RoryD]

To be honest this is a question you shouldn't need to ask. If you stick to MI's you can't go wrong

 

[London Gas]

Not asking a question, seeing what others opinions of this are as I feel I often come across boilers where people are just tweaking valves rather than carrying out a service.

 

[Chalked]

If ratio starts to go. It's time for a strip down. Adjusting air will just mask the problem.

 

[stratplus]

Evening boys and girls,


There have been posts like this before I'm sure but I am curious as to what others are doing when servicing boilers more so when working on ones with pre-mix gas valves as I feel I am either doing what we was taught in college or I'm missing a trick or two somewhere... I often when taking on new customers look over any previous paperwork they have just to see what has been done, check if boilers with common faults or safety issues have been repaired or not (such as flue collectors on vaillants/glow worm) and check previous readings etc. A few jobs I have been to recently have been in a really bad way, two were Worcesters with perfect readings but gunked up heat exchangers and poor fan pressure readings out of scope, this makes me assume that people are just straight away adjusting the ratios if their CO2 is out or any other readings which personally I find can be dangerous and a poor service, just wanted to see what others felt regarding this and if you adjust these valves before checking the burner/heat exchangers? (Granted manufactures instructions typically cover this)

Do you guys do basic services for low prices checking the appliance for safety and correct operation and then charge more for a full strip and clean with new seals?

How do you identify a gunked hx?