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How can I fix potterton puma80 combi?

Hot water heating fine but when I put CH on it cuts off after 30 seconds
victoria Hedley, December 2007
Still no c/h any sujestions please.
Hot water ok

Victoria Hedley, December 2007
Still no c/h any sujestions please.
Hot water ok

Victoria Hedley, December 2007
Thank you for replying.
Yes pump runs on heating.
Yes seams to be sufficient system pressure.
Three valves under boiler open.
Works perfect on hot water.
Few seconds after swiching on c/heating thermostate cuts in.

Victoria Hedley, December 2007
Thank you for replying.
Yes pump runs on heating.
Yes seams to be sufficient system pressure.
Three valves under boiler open.
Works perfect on hot water.
Few seconds after swiching on c/heating thermostate cuts in.

Victoria Hedley, December 2007
ON HEATING - DOES THE PUMP RUN?
IS THERE SUFFICIENT SYSTEM PRESSURE?
OBVIOUSLY THERE IS INSUFFICIENT WATER CIRCULATION --WHY
ARE THE VALVES OPEN UNDER THE BOILER?

MAY BE DUE TO A FAULTY VALVE WITHIN THE MACHINE
I ASSUME IT WORKS PERFECTLY ON WATER

I NEED MORE INFO

EX POTT REP

REGARDS
DAVE

DAVE B, December 2007
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