Hi Guys, just got a call to look at a Remeha Avanta 18V tomorrow . Homeowners had no hot water or heating for couple days now, boiler is displaying an E4 fault code but the Danfoss HSA3 motor valve is "damp". Just looked up the MI and can't see how an E4 code would tally with a knackered 3 port ? could there be a short inside the valve upsetting the boiler ? Thanks in advance !!