Basic Troubleshooting Flowchart; Power On Flow Chart - York DM090 Installation Manual

Monitor
FIGURE 31 - BASIC TROUBLESHOOTING FLOWCHART
FIGURE 32 - POWER ON FLOW CHART
52
Monitored
No
Programming?
Systems
Problem?
Yes Yes
Program
Unit
Trip/Failure
Control
Board
No
Yes
Turn off ID Fan on
Blower Motor >30 secs?
Yes
No
Lossof Call
for ID Blower?
Power to
Unit
Initialize ASCD
No No
Call for
Heating?
Yes
Call for
Heat
Energize ID
Blower Motor
Yes
No
Fan off
>10 secs?
Yes
No No
Call for
ID Blower?
Yes
Call for
heat?
No
Energize ID
Montior
127408-YIM-B-0606
Loss of
Yes
Heat Off
Call for
Heating?
No
Call for 2nd
Stage
Cooling
Yes
Call for First
Stage?
Cooling?
No
Call for 1st
Stage
Cooling
Yes
Loss of Call
Cool Off
for Cooling?
Yes
Voltage @
Gas Valve?
No
Blower
Unitary Products Group
No
Yes