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I personally think that preheat/warmstart call it what you will has got a lot to answer for, unfortunately you have it on the Isar but it cant be switched off, prolonged use of it causes problems with plate heat exchangers scaleing up in hard water area's, changing it isn't too difficult for an...

The number to call is: 0800111999 :-)

You wont have fumes in the bathroom from the condense waste not unless those fumes can find a way through the boilers trap and to do that they would have to defy the laws of physics & logic for starter, so balancing on top of a ladder 5 to 6 mtrs high in a gale pouring boiling hot water from a...

Have you considered having an electric shower, the approved way is to have hot & cold at the same head pressure, to increase the pressure you would need to raise the storage tank (if possible) or incorporate a pump, neither option would be cheap, you cant just go mixing high & low pressures with...

Your shower pressure will be determined by the distance the CW tank is above the shower head, both your supplies to HW cylinder and shower CW should be fed from the same tank, the cold tapping should be taken from a lower point than the one supplying you cylinder, so should the tank fail to...

Look around as some of them would like you to think that :)

Technically it is part of the flue as stated but your boiler should have a condense trap so no products of combustion should be able to pass the trap, that said I have worked with engineers who have shut down boiler as unsafe for no other reason than a small drip from a joint in the condense waste.

Im assuming you have a combi boiler so therefore your problem is likely to be due to the diverter valve letting by, is the water less hot also as that is another symptom when the valve is letting by.

Ive enjoyed this exercise in problem solving a real team effort, 30 years ago + I did alot of this kind of stuff so it was good to find the grey cells are still working lol

No doubt some smart a$$ with 1/2 a days training & a G3 ticket will condem it because the actual HW volumn does not match the volumn specified on the data plate :-)

Best to use a pipe stat as its backplate which makes contact with the pipe to register the temp is curved or angled unlike the cylinder stat which is flat.

Doe that mean your cylinder HW volumn will increase after all the air has been absorbed into the water?

Sounds like the valve is too tight or you have a defective actuator, I apply silicone grease and work it in a bit, heard that WD40 can react with some plastics, not too sure about that as it shines my car bumpers OK :)

How would you fit an external EV, you cant isolate the internal one which is only a trapped bubble of air after all, its no big deal to regenerate it.

Port AB is the flow from the boiler, port A is the flow to the rads while port B is flow to HW cylinder indirect coil, did you check the valve spindle was nice & free to move, the amount of travel of the spindle is very little with the Honeywell type.

Your actuator should have been in the HW position when unpowered so that is where the valve spindle should be also. What make/model is it, Im assuming its a Honeywell or clone as you say you can see the microswitch, can you move the spindle by hand, if not you neet to free it as the springs are...

Turn the power off and you should hear the motor freewheel back.

Just a suggestion, why not use an electronic programmer and future proof it, besides the fact their probably cheaper they also have features like 1 hour plus etc and you will be able to properly update you system with a 3 way valve with room & Cylinder stats in the future, you must be realistic...

Its worse than that, when the valve is in heating only position the motor remains powered up and is effectively jammed as it cant travel any further, it says a lot about the synchonous motor used, most electric motors would burn out in minutes if treated like that. Pushing the lever over and...

The motor will (spring) return to the hot water position (unpowered) only when there is a demand for HW, but will sit there in the heating position even after heating has gone off. The manufacturers re- configured the wiring around 30 years ago, prior to then these valves returned to the...