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@ DIYWell No "mixer" required, try a search for "dual flow"...there's plenty of choice. Merging of varied pressure hot and cold streams, although there may be need for some obdurate adjustment of the feed with most flow.

They are all passing the buck! - going round and round in ever decreasing circles and finally disappearing up there own portholes. The service began to deteriorate following the gas transportation bill when gas companies stopped having area district inspectors, that dealt with any practical...

Maybe try a search on this site for problems that appear as reversed flow or similar (the effect of pumping against a closed off pipe leg with no through way or outlet). It can be too deep a subject to grasp at first hand. Zone valves are not snap acting, there is a period of time that lapses...

Dear vexation, my intention is to guide you in the right direction, nothing more. Ideally, you need a full flow primary loop and piped primary bypass integrated into the boiler's pump overrun facility. I would forget the integral bypass at this time as its placement seems unable to cope with...

If the lockout lamp is lit it will be a burner problem, if it isn't lit there is no need to press it. First, locate the overheat/limit stat which is close to the control temp stat, there will be a small button that may have popped out, if so press it in and see if the burner starts up. Usually...

Right from your opening post i could see you had that inquisitive trait and clear expressive style, just a gentle nudge in the right direction was all that was needed to sort out the problem yourself. A great result AJ Best regards to all participants.

Sorry AJ, without being there i can't help much more, maybe familiarise with the sequence of the box and fault info' to see if anything rings a bell before you get another control box. Ask if something is unclear http://www.fmfranklin.com.au/products/data/l&g/loa2-loa3.pdf

Re:- "The fuel ignites and then immediately 5 or so seconds later, locks out." The above means the sequence is working o.k up until and during ignition, then after the few seconds detection time locks out due to "not detecting a flame". Residual resistance? - throughout the sequence there is a...

Check the wiring form the photo cell for any cracks etc', this wire must be perfect, if not renew. Check that this wire is not in close contact or near to any other wires whatsover. Check the shielding of this wire (if any) and check the sheild continuity to earth, the faintest signal leak...

mark55uk, it was only a quick general indicator of the type (octal) - the one below is more in line with the type i use for zone valve micro's (and cheaper!) I prefer the octal base type to allow for quick testing (swaps) with van stock and with call backs to commercial customers. Your choice...

The load on the micro switch is the problem, asking a tiny switch to start pumps and boilers and other ancillaries in 'heavier loaded' system is oviously asking too much. In these situations i have fitted relays as mark55uk mentions with excellent problem solving results. I use an octal base and...

@ les186 I would have the system checked over to see what caused the overheat stat to trip in the first place. eg: pump throughput, closed zone valves, closed bypass, pump overrrun, etc.

@FiremanT, your RGI advice is correct. Also this particular model came without an isolation valve but that was not the main problem. Details are bleak and sad, i would never disclose court case liabilities details in an open forum. regards.

This gas appliance, the focal point fire has an outer rear case with sealed cut-outs for concealed connections, so bearing in mind that any service work on the gas control asembly would need the gas supply isolating and therefore requires an *accessible* appliance isolating valve as per the gas...

Loosing overnight all the heat that has soaked and absorbed into the building fabric during the timed day period is a waste, theoretically it would be more cost effective not to loose all that heat. Having a night time temperature set-back facility would help to maintain some minimal level of...

No way!

@picasso 1. Because it is a ring main, full flow loops have no need for bypass, re: -> "16 radiators all teed into the ring main" - with all trv's closed or almost closed, a ring main still has full flow returning to the boiler. Full flow loops extend the life of the boiler as there is little...

@bhm 1712, Firstly, that is a great system you have fitted. There are things to consider with such full loop systems... 1. An auto bypass is not required, if any are fitted they must be set not to function, because a greatly varianced flow factor at the boiler is undesireable for full flow...

Also check for the correct wiring to the old glow worm boiler, many models have a pump overrun incorporated into the boiler stat, this would have needed another live wire (bypassing the room stat) to overrun the pump, this live would normally be wired directly to the boiler isolation spur.

A "low loss header" would be a viable solution and not too expensive. It would be totally automatic in its output distribution and to its heat sources input. For example a 2" LLH can be had for about £180 or 1 -1/2" about £120, would give automatic "no valves" blending. regards