York DJ150 - Manual (Page 44)

035-19046-002-B-0104
44 Unitary Products Group
FIGURE 28 - BASIC TROUBLESHOOTING FLOWCHART
Monitor
Monitored
Systems
Problem?
Call for
Cooling?
Call for
Heating?
Call for
Heat
Yes
No No No
Call for 1st
Stage
Cooling
First
Stage?
Call for 2nd
Stage
Cooling
Yes
Yes
Loss of
Call for
Heating?
Loss of Call
for Cooling?
Heat Off
Cool Off
Yes
Yes
No
Call for
ID Blower?
Fan off
>10 secs?
Energize ID
Blower Motor
Yes
Yes
No
Programming?
Program
Unit
Control
Board
Trip/Failure
No
No Lossof Call
for ID Blower?
Turn off ID
Blower Motor
Fan on
>30 secs?
Yes
No
Yes
No
No
Yes
Yes
No
FIGURE 29 - POWER ON FLOW CHART
Power to
Unit
Initialize ASCD
Call for
heat?
Voltage @
Gas Valve?
No
No
Energize ID
Blower
Yes Yes
Montior