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My bell will not sound and trouble light with the # 3?

When I check system trouble (function 4) #3 lights up and beeps. The manual says #3 is wireless receiver trouble. What is a wireless reciever and how do I fix the problem?
Larry, June 2010
Impossible to answer as no information AGAIN !!

Do you know how many different makes & models of control equipment there are?

Neither do I, I can't count that high.

acorn, June 2010