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mutley racers

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Morning all. I have a Worcester greenstar which keeps giving U codes by counting up to 9. Cannot see these codes in the manual. Any ideas? Cheers
 
Never seen that one before. Is it doing anything else? Any noises/low pressure?
 
Basically overheats. Turns on, temp shoots up to 90 and starts counting up with the U codes. Either sludge or pump failing me thinks
 
Its basically an overheat. They represent the temperature over 90 or 100 degrees I think.
 
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