WT8840 TRADE WATER HEATER CONTROLS
34-00013EF—01
6
When the solid light is present, the pilot and
main valve will not hold. When the status
indicator goes out, the user can restart the
system. (Approximate shutdown time is one
minute.)
3.
After status indicator analysis and appliance
repair is complete, turn device knob to OFF, wait
until the indicator goes out, then perform
lighting procedure.
4.
Status indicator light should be in normal mode
(1 flash) with the knob in the PILOT position.
Turn the device knob past the water temperature
in the tank should turn on the main burner. The
Status indicator light will strobe every three
seconds when there is a call for heat.
5.
In the event of multiple failure codes, the next
failure code follows the previous failure code by
approximately three seconds with higher flash
count first.
*
LED Error Codes are flashed once per second, with a three-second pause between repeating the error code.
**
Maximum two different errors can be displayed simultaneously if more than one error has been detected.
Table 3. Troubleshooting with status light visual indication.
LED Error
Code
**
Number of LED Flashes
*
Detected Failure
Recommended Action
Normal
operatio
n. No
action
required.
1 flash
every 3
seconds
Not an error;
indicates the
electronics is holding
the Pilot Valve open
and the Main Valve
closed.
You can now turn the knob to a
desired setpoint temperature. LED
will continue to flash 1 time every 3
seconds while in Idle mode (no call
for heat).
Strobe
every 3
seconds
Not an error;
indicates call for heat
during normal
operation, Main valve
open.
None.
Action
required.
2 flashes
Low thermopile
voltage; main valve
not turned ON.
Check thermopile and its
connections. Check pilot flame.
4 flashes
Temperature cut-out
limit reached.
Check the valves and the water
temperature sensor. Reduce the
water temperature setpoint.
Thoroughly check out main valve
operation and water temperature
control before walking away.
5 flashes
Water temperature
sensor failure.
Check water temperature sensor
and its connection for open
circuits, shorts, or differences in
resistance between the two sensor
elements.
6 flashes
Tank leakage
detected by
accessory module.
Control recovers after receiving
message from accessory module.
7 flashes
Electronics Failure
Replace control module.
8 Flashes
This is just a warning;
The control does not
see power decaying
with the knob in the
OFF position.
Check valves.
Solid ON
Not an error—
indicates that the
control is in OFF
mode.
None; wait until LED turns off if you
want to restart the system.
