Honeywell W8735B User Manual
TELEPHONE ACCESS MODULE
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a
When a W8635B Equipment Interface Module is installed and L terminal is correctly used.
b
W7835A Discharge Temperature Sensor is required.
c
Normally open (N.O.) sensor contact
is
required. Keep the wire length between sensor and W8735B as short as possi-
ble and ensure wire is not subjected to any electrical interference.
TROUBLESHOOTING GUIDE
Table 5. Dial-out Sequence Conditions.
Alert Messages
Possible Causes
High Temperature
The room temperature exceeded the high limit temperature setting
programmed in the W8735B.
programmed in the W8735B.
Low Temperature
The room temperature exceeded the low limit temperature setting programmed
in the W8735B.
in the W8735B.
Heat Pump
a
A heat pump compressor fault occurred.
Heating System
b
The system heat output is below the acceptable performance; possible heating
system failure.
system failure.
Cooling System
b
The system cool output is below the acceptable performance; possible cooling
system failure.
system failure.
Auxiliary Input
c
The auxiliary sensor connected to the auxiliary input terminals has tripped.
Filter Change
The thermostat is indicating a filter change is required for the heating/cooling
system.
system.
Power Outage
A power outage exceeded the maximum allowable time.
*
Symptom
Possible Cause
Solution
Battery indicator is on continuously.
Battery is either dead or not installed.
Install or replace battery.
Battery indicator is flashing with a
steady on-off pulse.
steady on-off pulse.
Battery is weak.
Replace battery.
Battery indicator appears to flash
momentarily every ten seconds.
momentarily every ten seconds.
Battery is good.
No action required.
Telephone Access Module does not
answer.
answer.
•
Power is not connected or 90-second
delay is in effect.
delay is in effect.
•
Phone line is not connected.
•
Telephone line is out of order.
•
Wait 90 seconds and try
again.
again.
•
Connect telephone line.
•
Contact telephone company.
On line indicator is illuminated.
Telephone module is in dial-in or dial--out
sequence.
sequence.
Wait for the call to end.
Auxiliary input indicator is illuminated.
W8735B detected a contact closure on
auxiliary input terminals.
auxiliary input terminals.
Determine cause of contact
closure. Remedy problem
according to contact
manufacturer instructions.
closure. Remedy problem
according to contact
manufacturer instructions.
W8735B indicates, “The system is not
responding.”
responding.”
W8735B is not receiving information from
the thermostats.
the thermostats.
Make sure all connections
between communicating
devices are good.
between communicating
devices are good.
Password cannot access the Telephone
Access Module.
Access Module.
Incorrect pass code entered.
Press and hold the pass code
reset switch for five seconds.
The pass code is reset to 1-2-3-
4. Retry with the default pass
code. See Fig. 11.
reset switch for five seconds.
The pass code is reset to 1-2-3-
4. Retry with the default pass
code. See Fig. 11.