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SBD TANK TYPE HEATERS
SERVICE HANDBOOK
Technical Training Department
Ashland City, TN ©2003
29
TROUBLESHOOTING THE EFFIKAL DAMPER (continued)
Condition:
Thermostat closed, damper open.
STEP 9B
A1 IS CORRECT, CHECK SERVICE SWITCH
POSITION
NEHT FI
Switch is incorrect position Replace damper board/motor assembly.
Switch is not in correct position • Adjust switch
• Cycle thermostat to verify that damper
operation is correct.
Service
Switch
Damper
Open
Damper
Auto