resideo WT8840 Série Instructions D'installation page 7

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
LED Error
**
Code
Normal 1 flash every
operation. 3 seconds
No action
required.
Strobe every
3 seconds
Action 2 flashes
required.
4 flashes
5 flashes
6 flashes
(WT8860A, B
only)
7 flashes
8 flashes
9 flashes
(WT8860A, B
only)
10 flashes
(WT8860A, B
only)
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.
Table 4. Troubleshooting with status light visual indication.
Number of LED Flashes
WT8840 & WT8860 TRADE WATER HEATER CONTROLS
in the tank to 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.
Combustion
chamber high
temperature limit
reached.
(Door temperature
sensor failure.)
Electronics Failure
This is just a warning;
The control does not
see power decaying
with the knob in the
OFF position.
Door temperature
sensor failure.
Abnormal
combustion chamber
temperature profile
during heating cycle.
Not an error—
indicates that the
control is in OFF
mode.
7
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.
Replace burner.
(Check door temperature
sensor and its connection for
open circuits or shorts.)
Replace control module.
Check valves.
Check door temperature sensor
and its connection for open
circuits or shorts.
Clean all combustion air
intakes to the appliance. Clean
the burner. Remove all
obstacles that may restrict air
flow to the burner.
None; wait until LED turns off if
you want to restart the system.
34-00013EF—05