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Update: expansion tank, DHW exchanger + overheat stat changed. System now running like a dream. Now, if this baby can give me another 5 years, that will delay the pain of shelling out on a new 37CDi Thank you for everyones help. :D

Oh dear. DHW exchanger and expansion vessel both need changing ( £245 for parts ). Friend suggested use Worcester for a fixed price repair (£215 inc VAT ). Called Worcester who say 350 is obsolete, so won't come out! :cry: Looks like I will have to get my local plumber back out to...

Update: water pump was tired and has been changed. Also automatic air vent. My expansion tank diaphragm is faulty, as was leaking water when valve pressed. Still cutting out after running Hot Water, so cleaning solution applied. New hot water manifold on order also expansion tank. All...

Thank you for opinions - most useful. I've had the central heating sensor changed - the old one was falling apart on the terminals. Unfortunately, the fault is still on i.e. C/H works OK, but hot water causes an overheat in less than 2 mins. Seems to be getting worse. My Gas Safe mate is...

Thank you - yes, the HW is working OK and is a good temperature. The boiler is now inter failing ( overheat stat ) 1/2 way through a shower, or 5 seconds after finishing a shower. I'll measure the sensor resistances as suggested. Cheers, Currybum

Thanks Agile for that fast response. Well, things haver actually moved on since my last post. Now, the overheat is popping WHEN running hot water for several minutes ( as opposed to after running the water ). Does this help narrow down the Issue e.g. could it be the central heating sensor, or...

Hi All, First post, so please be gentle. My faithful Worcester 350 has started to knock out the overheat button. This only happens after running the hot water for a long time e.g. bath / shower. It's fine on central heating. Looking at the instructions, looks like overun should keep...

I have a Heatline S24 with same fault i.e. intermittent loss of H.W. & C.H. with error 90 showing on LEDs. The ionisation probe has been changed and the PCB. Still the same! The boiler ignites, runs for 5 secs, then stops. Tried again about 3 times, then error 90 appears. The is so...