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Your pressure problem is most likely to be the twin pass heat exchanger allowing mains to over pressurise the heating system, if you close the black square plastic valve under the boiler on the right hand side and drop the pressure by bleeding a radiator to 1.5 and monitor it, as for the...

If the switch had snapped the boiler wouldnt fire up, is there a hot tap open/dripping anywhere stopping the heat going to rads, if not and all controls are calling for heat it may be a problem with the pump??

Diverter valve passing to radiators when hot water preheat is on.

Not too familiar with he model but standard cb25 has a microswitch on top of the diverter valve, if you drop the front panel down it is a u shaped microswitch, if you push it up to disconnect from the diverter valve and then make/break microswitch, cant remember if it works when on or off. Try...

Was at an Ideal Mini the other day and it was installed in a communnal attic space, I know that it should be floored/Lighting and a fixed ladder etc but is there any other regulation regarding the fact that it is in a communnal attic space as I cant see anything in my books, just looking for...

Just a bit, will mind that in future, have learnt a bit about these boilers during this, thanks.

Spot on again Tony, unknown to me the house had a new bathroom fitted by another company and they must have piped it wrongly, didn't realise this when changing the aquasensor as someone was changing the kitchen tap at the same time so we had mains isloated, found out when removed turbine today...

Tony - boiler has been working for years so im assuming its piped the right way, thanks for advice. Chris - I replaced the whole aquasensor and it can only be fitted one way or can the 3 wire sensor be in the wrong position, thanks for advice. Will see when I go back

Yes I changed the whole unit which had the 3 wire sensor so pcb it is then, is there a way I could have checked this sensor when tap on/off as in resistance between wires, thanks for your help.

Was at one of these today, heating ok but no hot water, checked flow/filter and replaced dhw aquasensor but still doesn't fire up for dhw, went through fault finding flow chart which says check/replace hall stat before replacing pcb, can anyone help me with this before ordering a new pcb as dont...

Have u tried reducing the flow at the tap to see if the temperature increases as the boiler will have a 36 degree rise at about 9l/min and incoming mains will be cold, u could also check the 22mm pipes when water running to check if heat is passing down to rads, could also be thermistor fault or...

First of all check the pressure gauge on the left hand side, should be between 1 and 2 bar, does the boiler fire up when you open a hot water tap as it may be the hot water flow switch.

First slide down slots that hold batteries in wall thermostat, dont pull right out, turn power to system off and back on, push and hold in the 2 learn mode buttons for 10 seconds or until it flashes, then push batteries back into wall thermostat doing the left side first then the right side...

One is a mixer tap but the other sink is seperate taps, thats what i thought at first, they say it doesnt happen all the time but they notice it when brushing their teeth, thanks for your advice.

Was at a worcester greenstar 30cdi today and customer said that sometimes they get hot water through the cold tap at 2 sinks nearest to the boiler, how is this happening would fitting a non return valve on the cold inlet sort this out? Thanks.

With the power off check that all the wires are in position at the plastic connection to the gas valve as have had problems with these in the past and if you are confident with a multimeter and have instructions for boiler check for voltage at gas valve, cant remember if ac or dc.

Not being cheeky but did you put the plastic links in the right places on the pcb when you changed it.

Thanks thats exactly what i have been doing.

Hello Can someone please explain how to properly test a thermocouple( where to put probes) as have just been told what college told me was ******, I have been putting 1 probe on end of thermocouple and other on copper outer sheath. Thanks

Thanks John Nothing noticeable so will be on phone to shop tomorrow.