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dean.
Hi got called out tonight to the above fault, The boiler wont fire, the fan runs it goes through ingition then stops and E9 comes up, the systems been like this for 2 weeks so cold. Ive checked head pressure is fine, pump works, checked fuse on pcb, im thinking the flow temp sensor needs replaced , any one know what to check when testing it and is it a drain down job replacing it.im going to phone worcester in morning just checking in advance, thanks