Product Overview

26
W7100A-E
Use the applicable sections of Table 8 as a guide in troubleshooting the W7100 Controller.
TABLE 8—W7100 TROUBLESHOOTING GUIDE.
SYSTEM CHECKOUT
Problems Possible Cause Corrective Action
All heat stages
lock on.
1. Remote setpoint terminals open cause
setpoint to be interpreted as 143° F [62° C].
2. Shorted sensor terminals T-T1 interpreted as
-2° F [-19° C].
3. System malfunction.
1. Correct wiring or jumper P-P1.
2. Correct wiring.
3. Consult HVAC manufacturer equipment
manual and/or building engineering
requirements.
Discharge
temperature too
high.
1. Integral setpoint not at minimum position
when used with remote setpoint.
2. System malfunction.
1. Set integral setpoint at minimum position if
remote setpoint used.
2. Consult HVAC manufacturer equipment
manual and/or building engineering
requirements.
No heat. 1. Open sensor terminals T-T1 interpreted as
239° F [115° C] discharge (cooling locked
out).
2. System malfunction.
1. Correct wiring.
2. Consult HVAC manufacturer equipment
manual and/or building engineering
requirements.
No cooling. 1. Shorted or open discharge sensor terminals
T-T1.
2. Open reset terminals 6-7 interpreted as
maximum reset.
3. Heat changeover terminal 9-10 shorted.
4. Remote setpoint terminals P-P1 open.
5. System malfunction.
1. Correct wiring.
2. Jumper terminals 6-7 or connect reset
thermometer and verify resistance as per
Fig. 10.
3. Remove jumper at 9-10 or correct timer.
4. Jumper terminals P-P1 or connect remote
setpoint thermometer.
5. Consult HVAC manufacturer equipment
manual and/or building engineering
requirements.
Short cycling. 1. Test plug left inserted in bottom of W7100.
2. System malfunction.
1. Remove test plug.
2. Consult HVAC manufacturer equipment
manual and/or building engineering
requirements.