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Posted by Lee Powell on March 24, 2004 at 12:53:06:
running the central heating everything works fine, when running the hot water the overheat thermostat trips.
I have checked the manual to and checked the flow rate of the hot water and it is greater than 2.6 liters/min. I have had engineers in and they have stated that it is sludge in the system. He tested this by increasing the pressure in the central heating (by adding more water in) asked me to turn on the hot water and turn it right down. this ofcourse got the fault to show up.
What I need to know if the flow rate is ok, is there something else not working that is not shutting down the burners and causing the overheat thermister to trip, maybe the sensor for the water. I have checked the resistance of this and it reads 1.5K ohms, but this quickly drops to below 700 ohms. If this is not working correclty could this cause this fault?
Also is there anyway of reducing the temperature of the hot water coming out as it seem to very hot.
Thanks in anticapation of your response.
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