Table of Contents
Advertisement
If status code recall is needed, briefly remove then reconnect one main limit wire to display stored status code. On RED LED boards do not remove power or blower door before initiating status code recall. After
status code recall is completed component test will occur.
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 code is erased automatically after 72 hours. On
RED LED boards stored status codes can also be erased when power
(115 VAC or 24 VAC) to control is interrupted.
12 BLOWER ON AFTER POWER UP (115 VAC or 24 VAC)
if unit is powered up during a call for heat (R-W closed) or R-W opens during blower
on-delay.
13 LIMIT CIRCUIT LOCKOUT - Lockout occurs if the limit, draft safeguard, flame rollout, or
blocked vent switch (if used) is open longer than 3 minutes.
- Control will auto reset after three hours.
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:
- 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.
COMPONENT TEST
To initiate the component test sequence, shut OFF the room thermostat or disconnect the "R"
thermostat lead. Briefly short the TEST/TWIN terminal to the "Com 24V" terminal. Status LED
will flash code and then turn ON the inducer motor. The inducer motor will run for the entire
component test. The hot surface ignitor, blower motor fan speed (on AMBER LED boards
only) blower motor-heat speed, and blower motor-cool speed will be turned ON for 10-15
seconds each. Gas Valve and Humidifier will not be turned on.
CARE AND MAINTENANCE
WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death and/or property damage.
Never store anything on, near, or in contact with the
furnace, such as:
1. Spray or aerosol cans, rags, brooms, dust mops,
vacuum cleaners, or other cleaning tools.
2. Soap powders, bleaches, waxes or other cleaning
compounds, plastic or plastic containers, gasoline,
kerosene, cigarette lighter fluid, dry cleaning fluids,
or other volatile fluids.
3. Paint thinners and other painting compounds, paper
bags, or other paper products.
For continuing high performance and to minimize possible
equipment failure, periodic maintenance must be performed on
this equipment. Consult your local dealer about proper frequency
of maintenance and the availability of a maintenance contract.
WARNING
!
ELECTRICAL SHOCK AND FIRE HAZARD
Failure to follow this warning could result in personal
injury, death or property damage.
Turn off the gas and electrical supplies to the unit and
install lockout tag before performing any maintenance
or service. Follow the operating instructions on the label
attached to the furnace.
LED CODE
CONTINUOUS OFF - Check for 115VAC at L1 and L2, and 24VAC at SEC-1 and SEC-2.
CONTINUOUS ON - Control has 24VAC power.
RAPID FLASHING - Line voltage (115VAC) polarity reversed. If twinned, refer to twinning kit instructions.
-Blower runs for 90 seconds,
- Refer to #33.
-Defective control (valve relay)
- Leaky gas valve
327596-101 REV. B
Fig. 50 - - Service Label
SERVICE
STATUS
31
PRESSURE SWITCH DID NOT CLOSE OR REOPENED - If open longer than five minutes,
inducer shuts off for 15 minutes before retry. Check for: - Excessive wind
- Proper vent sizing
- Low inducer voltage (115VAC)
- Inadequate combustion air supply
- Low inlet gas pressure (if LGPS used)
If it opens during blower on-delay period, blower will come on for the selected blower
off-delay.
33 LIMIT CIRCUIT FAULT - Indicates a limit, draft safeguard, flame rollout, or blocked vent
switch (if used) is open. Blower will run for 4 minutes or until open switch remakes
whichever is longer. If open longer than 3 minutes, code changes to lockout #13.
If open less than 3 minutes status code #33 continues to flash until blower shuts off.
Flame rollout switch and BVSS require manual reset. Check for:
- Proper vent sizing
- Dirty filter or restricted duct system.
- Defective blower motor or capacitor.
- Inadequate combustion air supply (Flame Roll-out Switch open).
34 IGNITION PROVING FAILURE - Control will try three more times before lockout #14
occurs. If flame signal lost during blower on-delay period, blower will come on for the
selected blower off-delay. Check for: - Flame sensor must not be grounded
- Oxide buildup on flame sensor (clean with fine steel wool).
- Proper flame sense microamps (.5 microamps D.C. min., 4.0 - 6.0 nominal).
- Gas valve defective or gas valve turned off
- Defective Hot Surface Ignitor
- Low inlet gas pressure
- Green/Yellow wire MUST be connected to furnace sheet metal
45 CONTROL CIRCUITRY LOCKOUT Auto-reset after one hour lockout due to;
- Gas valve relay stuck open
Reset power to clear lockout. Replace control if status code repeats.
!
CARBON MONOXIDE POISONING AND
FIRE HAZARD
Failure to follow this warning could result in personal
injury, death and/or property damage.
Never operate unit without a filter or with filter access door
removed.
!
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care
and wear appropriate protective clothing, safety glasses and
gloves when handling parts and servicing furnaces.
The minimum maintenance on this furnace is as follows:
1. Check and clean/replace air filter each month or more fre-
quently if required. Replace if torn.
2. Check blower motor and wheel for cleanliness each heat-
ing and cooling season. Clean as necessary.
3. Check electrical connections for tightness and controls for
proper operation each heating season. Service as neces-
sary.
4. Inspect burner compartment before each heating season
for rust, corrosion, soot or excessive dust. If necessary,
have furnace and burner serviced by a qualified service
agency.
5. Inspect the vent pipe/vent system before each heating sea-
son for rust, corrosion, water leakage, sagging pipes or
broken fittings. Have vent pipes/vent system serviced by a
qualified service agency.
42
- Defective inducer motor
- Defective pressure switch
- Disconnected or obstructed pressure tubing
- Restricted vent
- Restricted vent
- Loose blower wheel.
- Excessive wind
- Defective switch or connections.
- Manual valve shut-off
- Control ground continuity
- Inadequate flame carryover or rough ignition
- Flame sense circuit failure
- Software check error
WARNING
CAUTION
A04223
Advertisement
Table of Contents
