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SBD TANK TYPE HEATERS
SERVICE HANDBOOK
Technical Training Department
Ashland City, TN ©2003
31
STEP 11 WIRE HARNESS TEST
STEP 11. WIRE HARNESS TEST. Test for 24 VAC between terminal 24V on the IID
module, and 24V GND.
NEHT FI
24 VAC is not present: • Check the wiring harness.
24 VAC is present: • Go to step 12.
Note: This test may be easier to conduct by removing the red wire from the IID terminal. Test for 24
VAC between the red wire and ground. Reconnect the red wire to the 24V terminal after the test.