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Posted by Harold hydronicnetwork.net on March 24, 2004 at 13:16:42:
In Reply to: Worcester 240 Combi BF posted by Lee Powell on March 24, 2004 at 12:53:06:
A thermistor reacts to temperature or NOT. Yours changes, so it is WHAT it is sensing, or the controller that has a problem.
If you did not annually have the heater completely disassembled, cleaned, rebuilt, checked and refurbished as suggested in the manual, that is the problem. The manual tells how to adjust the water temperature.
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