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Technical Training Department
Ashland City, Tennessee
SBN TANK TYPE COMMERCIAL GAS WATER HEATER
SERVICE HANDBOOK
©2003
If…
...then
115-125 VAC
is not present
see Test 1.
voltage
is present
white (right terminal) to
ground
but not
black (center terminal) to
ground
reverse supply wire connections - polarity is
reversed.
TEST 3 - CONTINUITY CHECK
OF HIGH LIMIT (ECO)
Conditions:
Power On – No Hot Water
Red, heater control “Call for Heat”
LED – on
Red, ignition control board
diagnostic LED – 4 Flashing
Note LED Flash Code before
resetting heater.
See Description of diagnostic
LED Flashes.
Turn Power “Off”
TEST 2 - POLARITY CHECK - continued
Continued on next page
TEST 2
Polarity Check
Check from on/off switch center and white wire terminals to ground