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Looking at the manual, it looks like there are physical connections: If there are four physical pipe connections to the boiler (2x flow, 1x return, 1x gas), I'm guessing someone may have (incorrectly) just plumbed in the pump/valve to the HW flow pipe near the cylinder (perhaps not...

OP, can you confirm if there are physically TWO pipes entering the top of the boiler or one? (It's not clear from your drawing) Looking at the manual, the top connection(s) are 1" BSP FLOW and the bottom is 1" BSP RETURN. The smaller 1/2" pipe is gas. DIA, I'm guessing that one of the FLOW...

I suggested port AB in case there was an easier flow through the radiator circuit pipework and both the cylinder and radiators feed into port AB. If the flow/return ARE correct (i.e. pump gets hot first), the CH return could still have been plumbed into the flow pipe during alterations. My...

OP, before making any changes to pipework, I would like to point out this is still only a theory as nothing yet has been proven. I would therefore suggest you follow DIA's earlier post (reposted below for clarity) which only requires you to disable the pump. The two pipes you want to be...

This is not the same as 4expaws, mine or DIA's theory. It looks like your still suggesting the valve is piped wrong or faulty? Please help the OP to prove / discount your theory? How should he identify the fault? If you still haven't read the whole thread, the OP has a ornate ceiling and...

Wow, some people really do have their head where it shouldn't be! :roll: - The idea came from 4expaw several pages ago, I drew 4expaw's idea over the top of OPs drawing for consistancy so HE could understand it! (DIA agrees his drawing is the same) Your "thought provoking thinking" had...

Glad to see we are all thinking along the same lines! (That drawing is schematically the same as I posted above! :wink: )

They are £6.60 each from here as a guide for the clip on type or you could use a IR thermostat (I brought one like this which works okay on pipes when used with black tape and I have found lots of other uses for it from cooking to balancing radiators! :))

Mike, one of the reasons this thread is now 12 pages long is several posters are asking the same questions that were discussed and answered in earlier posts. This is a typical example (It's already been discussed, replaced new and if you were to look at the pictures, already know the answer...

Thinking logically, to prove if the CH return is piped into the flow (as per 4expaw's earlier post) or totally blocked somewhere, you could: 1) Obtain a pair of clip-on pipe thermometers (or a IR thermometer), leave the radiators to cool and make sure all radiator valves are fully open. 2)...

In which case you appear to have a good flow through them and have a two pipe system (flow & return). With the system as it is, can you try turning the 3PV to CH only and see if the boiler still cuts out?

OP, can you try turning off all the other radiators appart from the two in the lounge. Then with the 3PV in the CH&HW position, check to see if they now heat up? (make sure both ends of the lounge radiators are fully open) If they heat up, you have proved you have a two-pipe system &...

A quick observation and something worth double-checking: The installation manual shows the boiler's flow is at the top & return at the bottom. If that is the case, the pump will be pumping the RETURN which will work okay when the 3PV is set for HW (Port B) but may have restricted FLOW feed...

I kept a secondary safety measure to protect my children from potentially getting burned by (unexpected) scalding hot water through the taps rather than protecting my cylinder per se.

I thought I'd have a look at the installation manual for the OP's boiler (Baxi Bermuda Inset 2, exact model unknown). The interesting thing is this paragraph: Looking though the manual, I cant see any other overheat circuit, if the OP's boiler is turning off, has someone incorrectly...

With a minimum modulation of 12.7kW, how do the 600 series handle the warmer outside temps without a lot of cycling? i.e. when the control requests ~40C flow I do agree modulating flow controls help with lower kWh, setting up my system correctly along with the new controls has helped me save...

Remember that the pump is (should be) wired directly to the boiler, cutting the boiler 230v will prevent the pump overun occuring which in turn could cause damage to the boilers heat exchanger. I have a 'normal' DHW cylinder; as the VR10 was designed for the Vaillant cylinder, I choose to...