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Diagnostic Codes
-73-
LED Status
Accessory Module
Status
Probable Cause
None No LED. Power not on.
1. No power at outlet.
2. Transformer bad, replace
transformer.
3. Transformer wire harness not
properly connected. Check all wire
connections.
Green LED on continuously. Power on (no fault). n/a
Red
One flash and three
second pause.
Leak alarm fault.
Inlet Shut-off valve
open.
Water heater tank leak.
Red
Two flashes and three
second pause.
Leak alarm fault.
Inlet Shut-off valve
closed.
Water heater tank leak.
Amber
Four flashes and three
second pause.
Leak sensor
malfunction.
1. Leak Sensor resistor removed.
2. Leak Sensor improperly
connected to Accessory Module.
Amber
Five flashes and three
second pause.
Gas control missing /
not connected.
1. Wrong gas control wire harness
was used.
2. Accessory Module was not
connected to gas control.
Red
LED strobe (quick
flashes).
Hardware error.
Internal electronics failure, replace
Accessory Module.
Status Probable Cause
Setback Control not on.
1. No power at Setback Control or outlet.
2. Transformer bad, replace transformer.
3. Transformer wire harness not properly connected.
Check all wire connections.
Setback Control is showing
“Conn” error.
1. The Setback Control is not connected to the Accessory
Module and/or the water heater gas control (at all).
2. The Setback Control wire harness has some wrong
connections. Replace the wire harness.
NOTICE
The leak detection alarm can be muted. Press the button on the front of the Accessory Module
to mute this alarm for 1 day.
CAUTION
Perform a cycle of the Test Mode on the Accessory Module on a regular basis. Perform the
cycle by depressing the “Mute” button on the Accessory Module for at least (7) seconds. In the
Test Mode, the Accessory Module will go through the following sequence:
• Inlet Shut-off Valve opened for (10) seconds with continuously shown Amber LED and
the alarm on for the first second
• Inlet Shut-off Valve closed for (10) seconds with continuously shown Red LED with and
Inlet Shut-off Valve installed (or flashing Red LED without Inlet Shut-off Valve).
• Inlet Shut-off Valve opened for (10) seconds with flashing Green LED.