Greenstar 30CDi boiler - overheating

It was last serviced in the summer. I've had it serviced every 12 months except for the last service where there was a 16 month interval between services. I guessing that my warranty my now be invalid?
 
Worcester are very accommodating to their consumers.

If the service record is generally correct I expect they would accept a slight delay on just one service date.

Ypomy
 
Sorry to hijack the post have a similar issue with a potterton pro max he plus was thinking either blockage or h/ex magna clean fitted was working fine last week?
 
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