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Hi, My Worcester Hi Flow 400 (9 years old) is playing up. DHW goes from hot to cool then back to hot while in the shower, CH takes a long time to heat the rads. Demand light will come on, pump will run, boiler will light, then after about 15 seconds will go out. After around 25 - 35 seconds the...

At work we use both the Fluke and the Meggar MFT, but most prefer to use the meggar mainly due to it being quicker on the ELI.