Bryant 352MAV - Manual (Page 12)

Fig. 16—Service Label
A01053
SERVICE
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 - Control will auto reset after three
hours. Reset switch or replace fuse link. Refer to #33.
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 - Defective control (valve relay)
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 - Stuck-open gas valve
23 PRESSURE SWITCH DID NOT OPEN Check for:
- Obstructed pressure tubing - Pressure switch stuck closed.
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 - Refer to #32
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. If it opens after trial for
ignition period, blower will come on for 90 second recycle delay. Check for:
*- Defective blower motor or capacitor - Restricted vent
- Proper vent sizing - Low inducer voltage (115VAC)
- Disconnected or obstructed pressure tubing - Excessive wind
- Defective inducer motor - Defective pressure switch
- Inadequate combustion air supply
33 LIMIT OR FLAME ROLL-OUT SWITCH IS OPEN - If open longer than three minutes,
code changes to #13. Flame roll-out switch requires manual reset. Check for:
- Dirty filter or restricted duct system. - Loose blower wheel.
- Defective blower motor or capacitor. - Defective switch or connections.
- 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. - Manual valve shut-off.
- Defective hot surface ignitor - Control ground continuity.
- Inadequate flame carryover or rough ignition. - Low inlet gas pressure.
43 LOW-HEAT PRESSURE, DRAFT SAFEGUARD (when used), OR AUX-LIMIT (when used*)
SWITCH OPEN WHILE HIGH-HEAT PRESSURE SWITCH IS CLOSED Check for:
- Pressure switch stuck open
- Disconnected or obstructed pressure tubing
- Refer to #32 and #33
45 REPLACE CONTROL
LED CODE STATUS
COMPONENT TEST
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.
HUM G R Y/Y2 W/W1
C
W2 OM
24 V
320893-101 REV. E
CONTINUOUS OFF
CONTINUOUS ON
RAPID FLASHING
LED
TWIN
TEST
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.
12 - CIRCUIT
CONNECTOR
- Check for 115VAC at L1 and L2, and 24VAC at SEC1 and SEC2 .
- Control has 24VAC power.
- Line voltage (115VAC) polarity reversed. If twinned, refer to
twinning kit instructions.
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