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Mend Valiant Combi Boiler Water Running Cycles

Problem with hot water on Valiant Combi Boiler?

When we are running hot water through our valiant combi boiler, the water cycles though hot and cold and never stabilises to a constant temperature. This has been happening for a few days.

On running thought the diagnostics on the boiler it would appear that the problem could be the main switch board, but I not am a plumber so I really have no idea.

Does my diagnosis sound feasiable? If so, Is this expensive to repair?

Paul Rostron
September 2007
ValiantValiant Combi BoilerHeating, Home Heating SystemsWater Running Cycles
100% its the dhw heat exchanger, remove it, pour neat fx2 in the connection holes, put in bucket, pour boiling hot water on top, leave 4 1 hr, refit

kris
September 2007
OK so on futher investigation i was wrong, my thoughts are now heading toward the DHW heat exchanger or the microswitch....... any confirmation would be gladly recieved

Paul Rostron
September 2007

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