Worcester Bosch 28i Junior. DHW fine CH causes error

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2 Mar 2009
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London
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United Kingdom
Hi,

My 28i Junior has begun giving us problems (must be nearly Xmas).

If we leave it switched to just deliver Hot Water, everything works fine.

If the CH is turned on, it runs fine for some time (approx til up to temperature) maybe 20 minutes. Then;
1) The burner stops (red ignition light off) and pump continues to pump.
2) The error light displays a rapid flashing code.

Neither DHW or CH will work until the boiler has reset, approx 5 minutes, after which the same sequence as above occurs.

The Pressure Vessel has been re-pressurised following advice on the forum and is very stable

PRV was changed last year and is not showing any leakage.

No cold rad's

Any suggestions appreciated as the plumber we normally use id away ATM.

Thanks

Steve
 
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