Use and Care Manual

15
®
SYSTEM SENTINEL
POWER
THERMOSTAT
IGNITION
PILOT VALVE
MAIN VALV E
ECO
“System Sentinel” Diagnostic System
The “System Sentinel” Diagnostic system on this water heater provides the user or service technician with a visual representation
of the operational status of the various sections of the water heater’s control system. A quick glance at the System Sentinel panel
on the front of the heater will give an indication of where to begin trouble shooting of a non operational heater.
The LED’s (light emitting diodes) on the panel are arranged from top to bottom based on their function in the normal sequence of
operation, and their function is explained as follows:
POWER
When illuminated, this green LED indicates that 120VAC power is
being supplied to the heater, the On/OFF switch is functioning and
the 24V transformer is functioning properly.
(Refer to Section 1 of Troubleshooting Guide)
THERMOSTAT
When illuminated, this red LED indicates that the thermo-
stat is functioning(calling for heat) and 24VAC power is
being supplied to the Damper Assembly.
(Refer to Section 2 of Troubleshooting Guide)
IGNITION
When illuminated, this red LED indicates that the Damper
Assembly is opened. For the standard burner, 24 VAC
power is being supplied to the Ignition Control Module,
and the ignition sequence has begun. For the Power Assist
Burner, 24 VAC power is supplied through the N/C side of
the pressure switch actuating the relay and supplying 120
VAC to the blower. After sufficient pressure is reached in
the plenum, the N/O side of the pressure switch closes
and 24 VAC power is supplied to the Ignition Control Mod-
ule beginning the ignition sequence.
(Refer to Section 3 of Troubleshooting Guide)
PILOT VALVE
When illuminated, this red LED indicates that the Ignition
Control Module is supplying 24 VAC power to the ECO
(Energy Cut Off device), or High Limit.
(Refer to Section 4 of Troubleshooting Guide)
ECO
When illuminated, this red LED indicates that the ECO
(Energy Cut Off device), or High Limit is closed, and 24
VAC power is being supplied to the PV (Pilot Valve) ter-
minal on the Gas Control Valve.
(Refer to Section 5 of Troubleshooting Guide)
MAIN VALVE
When illuminated, this red LED indicates that the Ignition Control
Module is supplying 24 VAC power to the MV (Main Valve) terminal
on the Gas Control Valve.
(Refer to Section 6 of Troubleshooting Guide)