Watts AERCO Edge CFR 3000 Operator's And Service Manual page 58

SECTION 9 TROUBLESHOOTING
The Stack Guard
Low Stack Temp
temperature is below the
Shutdown
Stack Guard Low Limit
Stack guard sensor is not
Stack Guard Sensor
installed.
Open
Stack Guard Sensor Stack Guard Sensor is
Short shorted
Figure 9-1: SSOV Actuator with Gas Pressure Adjustment (SKP25)
•
Check the system return water temperature. The
required minimum return water temperature is
120°F.
Ensure the stack guard sensor is installed in the
starter section and it is connected to the boiler
wiring harness.
Check for a short in the wiring connection between
sensor and CFR boiler.
• •