1. No Call Tone, but communication to and from the handset is fine.
Perform jumper test between terminals 1 and B. If no call tone, the unit is defective. If call tone sounds, check wiring between B on the VC-K and the button terminal on the VC-M panel. Make sure that the black common bus wire for all the call switches is connected to the B terminal of the VC-M panel. If still no call tone, switch B wire to different call button switch. If call tone is heard, then the button is bad. Otherwise recheck wiring.
Refer to VC-M Instructions.
2. No communication from VC-K to VC-M.
Check wiring between 1 of VC-M and 1 of VC-K.
3. No communication from VC-M to VC-K.
Check wiring between 2 of VC-M and 2 of VC-K.
4. Communication is fine, but no door release.
Check the wiring between 4 of the VC-K and 4 of the VC-M. Check to make sure the RY-PA relay is properly attached (black leads to L+ and L-).
Refer to VC-M Instructions.
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