Component Test - Bryant 333BAV Service And Maintenance Procedures Manual

If status code recall is needed, do not remove power or blower door. Briefly remove
and then reconnect one main limit wire to display stored status code.
LED CODE
CONTINUOUS OFF - Check for 115VAC at L1 and L2, and 24VAC at SEC1 and SEC2
CONTINUOUS ON - Control has 24VAC power.
RAPID FLASHING - Line voltage (115VAC) polarity reversed. If twinned, refer to
twinning kit instructions.
Each of the following status codes is a two-digit number with the first digit determined by
the number of short flashes and the second digit by the number of long flashes.
11 NO PREVIOUS CODE - Stored status codes are erased when power (115VAC or
24VAC) to control is interrupted or 48 hours after each fault is cleared.
12 BLOWER ON AFTER POWER UP (115VAC or 24VAC)- Blower runs for 90 seconds,
if unit is powered up during a call for heat (R-W closed).
13 LIMIT OR FLAME ROLL-OUT SWITCH LOCKOUT
hours. Reset switch or replace fuse link. Refer to
14 IGNITION LOCKOUT -Control will auto-reset after three hours. Refer to #34.
21 GAS HEATING LOCKOUT - Control will NOT auto-reset.
Check for: - Mis-wired gas valve
22 ABNORMAL FLAME-PROVING SIGNAL- Flame is proved while gas valve is de-
energized. Inducer will run until fault is cleared. Check for:
- Leaky gas valve
23 PRESSURE SWITCH DID NOT OPEN C heck for:
- Obstructed pressure tubing
24 SECONDARY VOLTAGE FUSE IS OPEN Check for: - Short-circuit in secondary
voltage (24VAC) wiring
31 HIGH-HEAT PRESSURE SWITCH OR RELAY DID NOT CLOSE OR REOPENED
Check for: -Control relay may be defective
32 LOW-HEAT PRESSURE, DRAFT SAFEGUARD ( when used) , AUX-LIMIT (when used*)
SWITCH DID NOT CLOSE OR REOPENED (DOWNFLOW ONLY*)If open longer than
five minutes, inducer shuts off for 15 minutes before retry.
ignition period, blower will come on for 90 second recycle delay.
*- Defective blower motor or capacitor
- Proper vent sizing
- Disconnected or obstructed pressure tubing
- Defective inducer motor
- Inadequate combustion air supply
33 LIMIT OR FLAME ROLL-OUT SWITCH IS OPEN
code changes to #13. Flame roll-out switch requires manual reset. Check for:
- Dirty filter or restricted duct system.
- Defective blower motor or capacitor.
- Inadequate combustion air supply (Flame roll-out switch or fuse link open).
- Open flame roll-out switch, or fuse link. Manual reset or replace.
34 IGNITION PROVING FAILURE - Control will try three more times before lockout #14
occurs. If flamesignal is lost after trial for ignition period, blower will come on for
90 second recycle delay. Check for:
- Gas valve defective or gas valve turned off.
- Oxide buildup on flame sensor (clean with fine steel wool).
- Proper flame sense current (.5 microamps D.C. min., 4.0 - 6.0 nom. in HIGH HEAT).
- Green wire MUST be connected to furnace sheet metal.
- Flame sensor must be ungrounded.
- Defective hot surface ignitor
- Inadequate flame carryover or rough ignition.
43 LOW-HEAT PRESSURE, DRAFT SAFEGUARD
SWITCH OPEN WHILE HIGH-HEAT PRESSURE SWITCH IS
- Pressure switch stuck open
- Disconnected or obstructed pressure tubing
45 REPLACE CONTROL

COMPONENT TEST

C
OM
R
W/W1 Y/Y2
W2
24 V
To initiate the component self-test sequence, shut off the room thermostat or
disconnect the "R" thermostat lead. Briefly short the TWIN/TEST terminal to the
Com24V terminal. Status LED will turn off. NON-CONDENSING FURNACE: The
control will turn ON the inducer motor low speed, then high speed and remain on
high speed for the entire test. The other components will be ON for 7 to 15
seconds: Hot surface ignitor, Low heat blower speed, High heat blower speed,
High cooling blower speed. CONDENSING FURNACE: The inducer motor will start
in high speed and remain on high speed until the end of the test, then shift to low
speed for 7 to 15 seconds. All other components will be tested in the same
sequence as the NON-CONDENSING.
Fig. 10—Service Label
SERVICE
ST A TUS
- Control will auto reset after three
#33.
- Defective control (valve relay)
- Stuck-open gas valve
- Pressure switch stuck closed.
- Refer to #32
If it opens after trial for
- Restricted vent
- Low inducer voltage (115VAC)
- Excessive wind
- Defective pressure switch
- If open longer than three minutes,
- Loose blower wheel.
- Defective switch
- Manual valve shut-off.
- Control ground continuity.
- Low inlet gas pressure.
(when used) , OR AUX-LIMIT(when used*)
CLOSED Check for:
- Refer to #32 and #33
TWIN
TEST
G LED
HUM
—8—
Check for:
or connections.
12 - CIRCUIT
CONNECTOR
320893-101 REV. E
A00302