Service Manual

SYSTEM OPERATION

ComfortNet™ System

FURNACE ADVANCED FEATURES MENUS

Submenu Item Indication/User Modifiable Options Comments

Fault 1 (FAULT #1) Most recent furnace fault For display only

Fault 2 (FAULT #2) Next most recent furnace fault For display only

Fault 3 (FAULT #3) Next most recent furnace fault For display only

Fault 4 (FAULT #4) Next most recent furnace fault For display only

Fault 5 (FAULT #5) Next most recent furnace fault For display only

Fault 6 (FAULT #6) Least recent furnace fault For display only

Clear Fault History (CLEAR) NO or YES

Selecting “YES” clears the

fault history

NOTE:

Consecutively repeated faults are shown a maximum of 3 times.

DIAGNOSTICS

Submenu Item Indication (for Display Only; not User Modifiable)

Model Number (MOD NUM) Displays the furnace model number

Serial Number (SER NUM) Displays the furnace serial number (Optional)

Software (SOFTWARE) Displays the application software revision

IDENTIFICATION

Submenu Item User Modifiable Options Comments

Heat Airflow Trim (HT

TRM)

-10% to +10% in 2% increments,

default is 0%

Trims the heating airflow by the selected

amount.

Heat ON Delay (HT ON 5, 10, 15, 20, 25, or 30 seconds,

default is 30 seconds

Selects the indoor blower heat ON delay

Heat OFF Delay (HT OFF) 30, 60, 90, 120, 150, or 180

seconds, default is 150 seconds

Selects the indoor blower heat OFF delay

Heat Airflow (HT ADJ) 1, 2, 3, or 4 Selects the nominal heating airflow (see

Startup Procedure and Adjustment –

Circulator Blower Speeds for additional

information)

SET-UP

THERMOSTAT M ENU

If this furnace is installed with a ComfortNet compatible heat pump, the system is recognized as a dual fuel system. The

balance point temperature should be set via the thermostat advanced menu.