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I think you mean "discontinued"; it has certainly not been disconnected :wink: The last problem with the boiler (and my last thread) was a year ago. Clearly we don't think in the same way, as I wouldn't replace any appliance because it required maintenance once a year. My car was...

None taken, everyone has their own way of approaching things. At ~£70 that heat exchanger is not much more than getting someone out just to look at it (certainly a lot cheaper than getting them to fit one!), old enough that it would probably be of benefit to replace in any case and certainly...

New PRV fitted and leak stopped. Still a very slight leak from just below the pump, where the pipes look to have been coated in some sort of sealant, but much better Also purchased some MC3 whilst at the spares counter - that will go in tomorrow night for a week to sort out the clogged...

OK, all day today spent fiddling with the boiler, mainly due to this type's well-known propensity to spring leaks all over the place whenever you touch it! Actions: - New return manifold now fitted - System drained (very brown) and expansion vessel charged to 13PSI/0.9 BAR (was essentially...

I see - thank you. I will have to take the HE off tomorrow to fit the new manifold, and will be checking the expansion vessel pressure at the same time (whilst I have the system emptied). Is there anything I can do to test the HE whilst I have it off, short of just squirting water through...

Hello again all! My boiler is on the blink again - it's a (now somewhat old) Worcester 28CDi RSF, and has previously had the DV diaphragm, fan and PCB replaced (by a competent tradesman where appropriate), as well as the manual timer replaced with a computerised one following various...

New fan sourced - £55 - and fitted plus boiler serviced for a very reasonable price by a local chap called Patrick of Eureka Plumbing and Gas. Hot water now working, and he sorted the gas fire (which by all accounts was in an appaling state!) whilst here, very happy! 45yearsagasman - as I...

Did one final check myself - hooked up u-gauge, turned on the boiler and observed no change at all in pressures at the APS tubes. Pretty certain it's the fan / venturi now, looking for a local gas-safe engineer to perform the necessary work.

New sealed PCB located for less than £50, so gave that a go. Has fixed the blown power LED and is a much newer revision (interesting to compare), but results remain otherwise the same. However, I have identified an error in the fault-finding flowchart in the service manual, which points at a...

The sensor leads disappear into the CC near the top of the right side panel, however tracing them up them made me realise I had the wrong pair at the PCB to begin with :roll: Correct pair do indeed have resistance < 1 Ohm, in fact showing as zero on my meter, so no problems there either.

Cannot access the sensor itself (appears to be at the top of the CC), but it is wired into the PCB, so I again checked it from there, and the part number is listed in the service manual. Resistance is definitely 16 Ohms (across the PCB terminals); I was going by the 240V/10A values listed in...

Thank you for the assistance. We do have plenty of Daves and Johns here also, that is true. HW and CH sensors are both 17 kOhm, measured at the PCB when cold. The sensors appear to be Honeywell 6655-90030004 variants, for which RT2 (expected resistance at current temperature) can be...

The APS (and tubes) are outside the combustion chamber, and all contacts mentioned are on the exterior of the APS or the PCB itself (no voltage across the terminals to which the fan is connected - cannot check the fan itself as it is inside the CC). The flue has been checked from outside...

Hi all - first post here though I have visited numerous times in the past prior to registering today. I have a problem with my 10-year-old Worcester 28CDi boiler - not the first problem but the first on which I need to ask particular questions. I am well aware that any gas work is a big...