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If the boiler is under 2 years old call Worcester out, they will replace the RF stat under warranty.

Ls means live supply from boiler to external controls, Lr is live return or switched live as has been said. According to manufacturers instructions all external controls should be supplied from Ls on boiler pcb, so when on/off switch on boiler facia is at off you should have no power to...

Your boiler is going to over heat. It has a pilot interruptor which if gas to water heat exchanger gets too hot it puts the pilot out. This will be caused by your water to water heat exchanger being coated with sludge or being partially blocked. It is a crap job to replace w/w heat exchanger...

you have a problem with your expansion vessel. If you decide to replace the vessel it would be advisable to replace the pressure relief valve at the same time as it may not hold pressure which tends to happen when they have been opened.

sounds like a pump problem. 2 flashing lights means an over heat. Hot water will work as the pump does not run during hot water demand on this boiler.

Yep , 28 SI

You could always do the easiest option and get a WB digi stat and receiver. Receiver is fitted where your digital timer is at the moment,just plugs onto PCB.

C1 is a re-badged SI. Non condensing combi.

Is he on commission :shock:

If you have a house fire or the like and it is to do with your boiler, your home insurers find out you have been doing it yourself then they will not pay out.

Give them a try anyway all they can say is no and you are no worse off, if they ask if it was serviced at 12 months just say yes.

Worcester oil boilers usually come set at a mid range from factory. So yes you can upgrade as per installation instructions will tell you.

If it is just out of warranty give worcester a call they may still come out under warranty if you lay it on thick enough, they are usually pretty good at customer service. As for too cold water causing boiler to trip, load of nonsense. Sounds like he has played with combustion settings and got...

£1200 for a power flush :shock: :shock: :shock: I'm in the wrong job. They quoted next door to me £750,saying they had a blockage when they had forgotten to put temp phial back into back boiler heat ex. This caused boiler to o/heat and hot water to come from header tank. Could it not just...

Lockout light on facia only illuminates when demand on burner as it takes it's power from the control box on burner. Without being in front of boiler it is hard to diagnose, but would start with solenoid on oil pump as it is allot cheaper than a control box.

He said sometimes the hot water works fine so cannot be a blockage within boiler.

2 flashing lights means boiler has went overheat. You have a sticking pump.

your central heating will work fine, but your hot water wont as there will be nothing to tell boiler you are running a tap for hot water.

As Gaz has said DO NOT close and re-open flow and return valves as they will leak once they have pressure on them again. To replace these valves when leaking is a royal pain in the butt as the the complete hydraulic section has to be removed to do so.

No it cant be the flow switch, as depending on how old the boiler is it will have a paddle type which either stick on or off no in-between, or the younger models have a turbine which fail in the off position only. That happens with a diverter valve with diaphragm such as the giannoni diverter...