Troubleshooting guide – Honeywell W8735B User Manual
TELEPHONE ACCESS MODULE
When a W8635B Equipment Interface Module is installed and L terminal is correctly used.
W7835A Discharge Temperature Sensor is required.
Normally open (N.O.) sensor contact
required. Keep the wire length between sensor and W8735B as short as possi-
ble and ensure wire is not subjected to any electrical interference.
Table 5. Dial-out Sequence Conditions.
The room temperature exceeded the high limit temperature setting
programmed in the W8735B.
The room temperature exceeded the low limit temperature setting programmed
in the W8735B.
A heat pump compressor fault occurred.
The system heat output is below the acceptable performance; possible heating
The system cool output is below the acceptable performance; possible cooling
The auxiliary sensor connected to the auxiliary input terminals has tripped.
The thermostat is indicating a filter change is required for the heating/cooling
A power outage exceeded the maximum allowable time.
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.
Battery is weak.
Battery indicator appears to flash
momentarily every ten seconds.
Battery is good.
No action required.
Telephone Access Module does not
Power is not connected or 90-second
delay is in effect.
Phone line is not connected.
Telephone line is out of order.
Wait 90 seconds and try
Connect telephone line.
Contact telephone company.
On line indicator is illuminated.
Telephone module is in dial-in or dial--out
Wait for the call to end.
Auxiliary input indicator is illuminated.
W8735B detected a contact closure on
auxiliary input terminals.
Determine cause of contact
closure. Remedy problem
according to contact
W8735B indicates, “The system is not
W8735B is not receiving information from
Make sure all connections
devices are good.
Password cannot access the Telephone
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.