Troubleshooting With Status Light Visual Indication - Honeywell WT8840 Installation Instructions Manual

WT8840 TRADE WATER HEATER CONTROLS
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.
LED Error
**
Code
Normal 1 flash
operatio every 3
n. No seconds
action
required.
Strobe
every 3
seconds
Action 2 flashes
required.
4 flashes
5 flashes
6 flashes
7 flashes
8 Flashes
Solid ON
*
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.
34-00013EF—01
Table 3. Troubleshooting with status light visual indication.
Number of LED Flashes
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.
*
Detected Failure
Not an error;
indicates the
electronics is holding
the Pilot Valve open
and the Main Valve
closed.
Not an error;
indicates call for heat
during normal
operation, Main valve
open.
Low thermopile
voltage; main valve
not turned ON.
Temperature cut-out
limit reached.
Water temperature
sensor failure.
Tank leakage
detected by
accessory module.
Electronics Failure
This is just a warning;
The control does not
see power decaying
with the knob in the
OFF position.
Not an error—
indicates that the
control is in OFF
mode.
6
Recommended Action
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).
None.
Check thermopile and its
connections. Check pilot flame.
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.
Check water temperature sensor
and its connection for open
circuits, shorts, or differences in
resistance between the two sensor
elements.
Control recovers after receiving
message from accessory module.
Replace control module.
Check valves.
None; wait until LED turns off if you
want to restart the system.