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Section 2... the “THERMOSTAT” LED
“System Sentinel” Troubleshooting Guide
Is Thermostat set at a tempera-
ture higher than the water tem-
perature in tank?
Thermostat is
defective or out of calibration
and must be replaced.
Adjust
Thermostat to a higher setting.
Is Thermostat LED now illumi-
nated?
Thermostat is calling for
heat, and 24 VAC power.
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
CAUTION
!
Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. VERIFY PROP-
ER OPERATION AFTER SERVICING!
Ensure that power is being supplied to
the water heater. Refer to “Section 1...the
POWER LED” in this Troubleshooting Guide,
and correct if necessary. Is the “THERMO-
STAT LED” now illuminated.
Ensure that power is being supplied to
the water heater. Refer to “Section 1...the
POWER LED” in this Troubleshooting Guide,
and correct if necessary. Is the “THERMO-
STAT LED” now illuminated.
Is 24 VAC
power present at Yellow Wire
Terminal inside Thermostat?
Is 24 VAC power present at
Blue Wire Terminal inside Ther-
mostat?
Is the “THERMOSTAT” LED Illuminated?