heat-timer ETS-LT - 08 TROUBLESHOOTING; Troubleshooting Display and Temperature Issues

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HEAT-TIMER CORP.
059327–00 REV. C
08 TROUBLESHOOTING
SYMPTOM POSSIBLE CAUSE RECOMMENDED ACTION(S)
No display or
distorted display.
No power to the ETS-LT
Control Module Control
Module, incorrect or
defective wiring.
Verify the ETS-LT Control Module Control Module is
receiving power, all power wiring is in good condition
and connected.
The ETS-LT Control Module Control Module requires
120Vac power to terminal 1 and 2, and earth ground
wiring to terminal 3.
Turn power to the ETS-LT Control Module Control
Module off then back on.
Display shows sensor
“Open”.
Sensor disconnected. Verify the sensor is properly connected to the ETS-LT
Control Module Control Module.
Defective sensor, wires,
or ETS-LT Control Module
Control Module.
Short the sensor input wires. The display should
read “Short”.
• If the display still reads “Open”, the device is
defective. Replace the ETS-LT Control Module
Control Module.
• If the display reads “Short”, test the sensor wiring
for continuity. Replace the sensor/wiring.
Display shows sensor
“Short”.
Defective sensor, wires,
or ETS-LT Control Module
Control Module.
Remove the sensor wires from the input terminals. The
display should read “Open”.
• If the display still reads “Short”, the device is
defective. Replace the ETS-LT Control Module
Control Module.
• If the display reads “Open”, test the sensor wiring
for continuity. Replace the sensor/wiring.
System reads incorrect
temperature.
Defective sensor or
ETS-LT Control Module
Control Module.
Disconnect the wires from the input terminals. The display
should read “Open”.
• If the display does not read “Open”, the device
is defective. Replace the ETS-LT Control Module
Control Module.
• If the control reads “Open”, and the difference is
within 5°F, replace the sensor.
No hot water. If a flow switch is installed, the
Flow Switch option is set to
“Yes”, and the flow input is
open, the mixing valve may be
marginally closed.
Verify Flow Switch setting and the position of the
mixing valve.
Water heater malfunction. Check water heater(s) to ensure proper operation.