Troubleshooting (Table 5) - Honeywell W8665A Manual

TROUBLESHOOTING (TABLE 5)

Symptom
Display does not come on.
Heating does not come on.
System on indicator
( = heat) is showing in
display.
Cooling does not come on.
System on indicator
( = cool) is showing in
display.
Wait is displayed and the
call for cool has not started.
2nd stage heat or cool (or
3rd stage heat) does not
energize.
Table 5. Troubleshooting Guide.
Possible Cause
Thermostat is not being
powered.
Communication is not being
completed.
Heating load at W8665 is not
connected correctly.
Thermostat is too close to
W8665.
Thermostat is too far away
from W8665.
Communication is not being
completed.
Cooling load at W8665 is not
connected correctly.
Thermostat is too close to
W8665.
Thermostat is too far away
from W8665.
Compressor protection is in
effect.
W8665 is not wired to a TZ-4
TotalZone™ Zone Control
Panel or EMM-3U Universal
Electronic MiniZone Control
Panel that controls the
multiple heat and cool
stages.
W8665A,E RF RECEIVER MODULE
Check if batteries are present and installed correctly.
• If batteries are in and installed correctly, replace
thermostat.
End and repeat the call for heat.
Check the Comm LED and Zone LED on the W8665
while the call is being made.
• If the Comm LED does not flash when thermostat
first calls for equipment, turn that zone DIP switch
to Off. Refer to Setup section to reset the W8665.
• If the Zone LED flashes continuously, turn that
zone DIP switch to Off. Refer to Setup section to
reset the W8665.
• Check if 24 Vac is present:
• Check between R and C on W8665.
• Check between W of troubled zone and C on
W8665.
If voltage is present, troubleshoot heating system.
T8665 Thermostat should be at least five feet away
from the W8665 during setup and operation.
Maximum distance between W8665 and
T8665A Thermostat should not exceed 200 feet.
End and repeat the call for cool.
Wait five minutes for the compressor delay to end.
• If the Comm LED does not flash when thermostat
first calls for equipment, turn that zone DIP switch
to Off. Refer to Setup section to reset the W8665.
• If the Zone LED flashes continuously, turn that
zone DIP switch to Off.Refer to Setup section to
reset the W8665.
• Check if 24 Vac is present:
• Check between R and C on W8665.
• Check between Y of troubled zone and C on
W8665.
If voltage is present, troubleshoot cooling system.
T8665 Thermostat should be at least five feet away
from the W8665 during setup and operation.
Maximum distance between W8665 and
T8665A Thermostat should not exceed 200 feet.
Compressor protection can be set on the T8665A
from 0 to 5 minutes to prevent compressor damage
due to rapid cycling.
Wait until the compressor protection period expires.
Wire W8665 to TZ-4 TotalZone™ Zone Control Panel
or EMM-3U Universal Electronic MiniZone Control
Panel to control multi-stage systems.
Check TZ-4 TotalZone™ Zone Control Panel or
EMM-3U Universal Electronic MiniZone Control
Panel and set correctly.
13
Action
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