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Section 1... the “POWER” LED
“System Sentinel” Troubleshooting Guide
Is the “POWER” LED Illuminated?
Is the “ON/OFF” Switch in the
“ON” position?
Turn switch to ON position. Is the
Power LED now illuminated?
Pow e r i s
being supplied to the heater,
the ON/OFF Switch is func-
tioning, and the 24V AC
Transformer is functioning.
Is 120 VAC power present at the
branch circuit connections to Black
wire of the switch and White wire of
the transformer ?
YES
YES
YES
YES
YES
NO
NO
NO
NO
YES
NO
NO
NO
Check circuit breaker or fuse and field connec-
tion of branch circuit wiring to leads of switch.
Repair or replace as required. Is “POWER” LED
now illuminated?
Is 120 VAC power present between
the Black and White wires to the
transformer ?
Is 24 VAC power present between
the Yellow and Gray wires from the
transformer ?
The System Senti-
nel Panel is defective and must be
replaced.
Replace Switch, then verify that
power is present. Is “POWER” LED
now illuminated?
NO
YES
YES
YES
CAUTION
!
Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. VERIFY PROP-
ER OPERATION AFTER SERVICING!
Replace Transformer, then verify
that power is present. Is “POWER”
LED now illuminated?