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because the boiler is so oversized, when it ramps up to max power the differential between flow and return becomes too great and it either ramps down or more often ramps down and stops and then goes into a waiting mode for 5 mins before repeating the cycle. Try reducing the power in D0 down to...

same as with vented system. the boiler won't know about! or you would use an sxi boiler which is a system boiler.

Hxi is a heat only so no pressure sensor. But it could give f22 if it doesn’t detect enough or too greater temp diff when it first fires. My bet would be pump speed down.

check that 230v is at the pump connections. it could just be loose wire at the pump end

job should done by a RGI. I would have thought if you supplied the part a qualified engineer could fit it for less than hours work

you should have your boiler set to heating mode on the front. ( the hot water mode is there but is a universal control panel for use with combi boilers aswell). your control for heating is via your programmable room stat and your hot water via your programmer in the airing cupboard. Why do...

Most likely system cleaner that has not been flushed out correctly.

i would first check the filter a the tank, followed by the next filter, then the tiger loop and then at the boiler. Are you certain you rang out of oil? it could be that the fire valve has activated and then you will not get any oil flow. If it has you should be able to reset it. one type is...

follow the fault finding flow chart. power to control box, then power to motor followed by photocell check for false light, if ok then power to ignition and power to solenoid. My guess is either control box or photocell ( or cable to photocell)

I service over 30 of this model with plastic traps and have no problems. But it does require them to be cleaned properly and the trap put back on correctly along with the baffle plate the correct way round or the trap can melt.

power to the condensate pump is 230v and is live when there is power sent to fire the burner. the condensate pumps can block and stick but can be stripped apart cleaned and they will work fine again. The flue ways on these need to be thoroughly cleaned with plenty of liquid cleaner(DUAL X) or...

as you have the system 637 boiler the canoe filter in the boiler return pipework is most likely to be blocked with the amount of crud on the filter and it could have also caused the automatic bypass to be stucking open. A quick drain down of the system wouldn't do any harm and then clean the...

lead work looks like it's poor as well and could be tracking between

Nope. Just un stitch the bricks outside put new bricks in. then core out another hole. easiest and probably only solution

yep i would go with heat store has air in the top so the sensors keep the valve on hot water mode

Hounsfield use lifetime aircraft grade hoses. They also have a braided sheaf

You can run it into the septic tank. The volume will not be great enough to affect the pH of the tank.

Screwfix do sell solvent weld 110mm fittings some are weld one end and push fit the other

lockshields can be on either flow or return. They are bi directional these days. We normally set the rads with lockshield valves open 1 to 1.5 turns open as a starting point and then adjust afterwards

Just use a mainsboost pump. These are wras compliant with a max of 12lt/min pumping ability. if flow is greater than 12lt then unit doesn't pump. But when the flow slows down it will then pump and boost pressure by around 1bar