worcester 24i junior dhw problem

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25 Mar 2006
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United Kingdom
Looked at one of these friday,dhw will work ine when heating is on,turn a tap on without te heating and fan will sart up and boiler goes to lockout,tested the flow turbine and im getting the required 5vdc to it but only 0.5v dc instead of the 1.5v to 4v when tap is turned on,but manual says this fault will produce a lockout light flashing 4 times per second but it is only flashing once per second,any body come across this problem before??
 
Odd, no diverter so as long as water runs it should not overheat. Could it be that the earth is no good and the electrical readings are off due to lack of adequate reference to earth? How long before the lock out occurs? Is the input correct?
 
When tap turned on without ch fan starts and it locks out within 5 seconds before burner ignites,input into flow turbine is correct,just strange hw it does not cause a lockout when the heating is on .
 
Saw something similar - turned out to be the pcb, boiler was only 18 months old (I assume we are talking about the SE Junior).
 

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