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I have a error code C2?

I have an error code C2 and red light (fault). When I put my code in sometime it come up with a fault with code ( U1).
Please advise what I can do to clear this fault
Mrs Hansa Patel, January 2013
could be alarm guy.but am not into guessing games

gts, February 2013
9800 ?

Fix Circuit 2.

Get an engineer out.

Alarm, February 2013
well for a start mrs patel,you could tell us the make of your alarm panel,then you will get some replies

gts, February 2013
link Click here to see other fixes for Honeywell Vista-20P.