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SBN71-120 thru SBN85-390, SBD30-150/199 TANK TYPE COMMERCIAL
GAS WATER HEATER SERVICE HANDBOOK
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Ashland City, Tennessee 7002 ©
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 water heater control.
● See Description of diagnostic LED
Flashes.
● Turn Power “Off”
0.0
Ohms
TEST 3
Continuity check of ECO (energy cut-off, high limit)
Black to Black wires of upper probe. Power is off.
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continuity is indicated (ZERO “0.0” Resistance) opens at 203° F; closes at 193° F. If water is
below 193° F, continuity is correct.
continuity is not present (meter reads “0.L”) replace ECO sensor, if water temperature is
below 193° F.
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•replace heater control if control will not manually
reset.