yeah u need the handet if its the lil wrench symbol on a curtis meter (combined instrument)
u can reset the intervals to never come on or to come on in intervals of 250 hours up to 1000 hours
the handset dealer cost is about 400 US dollars and some dealers wont sell them
get ur local service guy out to shut it off and tell them to come with the handset although u should have the machine pm'd anyway
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