Phil the Fluter
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I have a Baxi Duo Tec 28 E combi boiler and it has an intermittent fault that has baffled a number of Baxi engineers.
It was installed new in August 2015 and after a few months in January, it developed a fault. I turned on a hot tap one day and the water ran cold (as it normally does until the hot water arrives at the tap from the boiler) but, on this occasion, the cold water did not become hot. It became tepid for a few seconds, then ran cold again for a few seconds, then tepid for a few seconds, then cold, then tepid, etc, etc.
The boiler had a two-year warranty so I called out an engineer but, within a very short time of the problem showing itself (hours or less) the boiler was working perfectly again and was still working perfectly when the engineer arrived. He had no idea what the problem was and so was unable to fix it.
Some months later, exactly the same fault recurred and disappeared again before the engineer arrived. He too had no idea what the problem was and so was unable to fix it.
Some months later still, exactly the same fault recurred and disappeared again before the engineer arrived. This engineer, however, immediately suspected the diverter valve and told me that the valve cartridge was probably plastic and needed to be replaced by a solid metal version. He carried out the repair.
The boiler worked perfectly for several months but, a few days ago, exactly the same fault recurred and disappeared again the same day. The boiler is now out of warranty.
If anybody has any ideas, I would be most grateful for their advice.
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