no fan, heat, cool - can't activate system - http://www.hvacmechanic.com/ Forums
Original message
| wyman
 |  "no fan, heat, cool - can't activate system"
, posted Thu 10 Jul 02:26  
I am currently working with a Honeywell EMM-3 mainboard to control the hvac system. The central fan does not come on, and therefore neither does cooling or heat. This is a 2 zone system and neither zone will activate the fan.
The EMM-3 panel will sometimes show the system LED with a flashing orange - meaning it is in purge mode. The purge bypass button does not bypass the sequence, and it remains flashing with the 3 damper LEDs lit up with green (call for cooling).
I have tried resetting the system, but when I go to the t-stat to have a zone call for cooling, I hear the damper or actuator make a clicking noise. It clicks maybe for 2-3 minutes before it stops, and the system still does not come on.
At this point I am a little confused as to what is causing the problem. I've check the EMM-3 panel and there seems to be sufficient voltage at the damper connect. Is the panel bad? Or is it the damper motor or actuator?
Thanks.
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