Honeywell W7340 - Manual (Page 11)

W7340, W7345 COMMUNICATING ECONOMIZER LOGIC MODULES
11 63-2569—04
TROUBLESHOOTING
The status LED is visible through a hole in the device cover. A
priority-based LED flash sequence indicates a detected fault.
0.25 seconds elapses between each pulse, a higher pulse
count indicates higher priority. A two-second on period
precedes each repeated sequence.
The diagnostic bit position corresponds to the Modbus
diagnostic register. The diagnostic bit resets when the
respective fault is present. To read all active faults, read the
diagnostic register via Modbus function code 8 (no flash
priority needed).
NOTES:
— All pulse counts (Table 4) are based on the
number of times the light pulses off.
— In the event of a Communications Failure, the LED
pulses on for 0.25 seconds every 2 seconds.
Table 4. W7340 Economizer Checkout.
Description
Pulse
count
Diagnostic
bit
Booting (0-3 min. after power-up) NA 12
Mixed air temperature sensor fault 8 7
Outdoor air temperature sensor fault 7 6
Outdoor air humidity sensor fault 6 5
Return air temperature sensor fault 4 3
Return air humidity sensor fault 3 2
Indoor air quality sensor fault 2 1
Actuator fault 1 0
Proper operation (outdoor air
appropriate for free cooling)
Solid
ON NA
Proper operation (NO free cooling) 2 Hz flash NA
Communications failure 1 (pulses
on) NA