Faults with low water content boilers

[billychuff]

hello all, my boss has given me a list of possible faults to find on Y and S plan systems e.g only get hot water when heating on. S Plan, no heating (heating motorised valve not getting live to brown)
So my question is... would the answers be any different if it were NOT a low water content boiler. I had not heard of these until yesterday :icon9:

 

[diamondgas]

No is the answer as you're talking faults to system designs, 'Y'&'S' plans, not the heat source (boiler). All modern boilers, I'd say, are "low water content!" Domestic boilers anyways!

 

[doitmyself]

hello all, my boss has given me a list of possible faults to find on Y and S plan systems e.g only get hot water when heating on. S Plan, no heating (heating motorised valve not getting live to brown)

Doesn't your boss know how to fault find then? If so, tell him to read the Honeywell Wiring Guide (Last item on the page).

 

[That Extra Mile]

Low water content boilers will probably need to be wired for pump overrun. This isn't usually necessary for old models. Wiring into the control centre will therefore be different. Don't know if that'll affect what you're looking at?
Jonathan Harris, That Extra Mile Plumbing, London

 

[billychuff]

he knows how to fault find. He's setting me homework and TRYING to educate me. His wording is:- Wall mounted low water content boiler, 2x 2port MV's, 1) only get hot water when heating on (2) No heating (Heating MV not getting live to Brown)
This is why i questioned whether it was the boiler that had an issue or the system. He mentioned that the LWC boilers can have an issue with the thermostat as some can only store 1/4 pint of water

 

[diamondgas]

billychuff - sounds like you have a good gaffa mate! So what are your thoughts? Don't worry about getting it right. There's guys here who'll happily help manouver you in the right direction

 

[bill577]

(1) the hot water 2 port is open but the microswitch isint bringing the boiler on, when the heating comes on it heats both the rads and hot water

(2) if there is no power to brown on 2 port check if there is power to room stat from programmer and if stat is making.

 

[diamondgas]

bill577 ... spot on! I'd say :yesnod:

 

[billychuff]

Thanks for your reply Bill577, your help is much appreciated

 

[billychuff]

Thanks Diamondgas. This is the reason that i like this site. I just wish that i was in a position to do the same for others