Carrier 140/E Series Installation, Start--Up, Operating, And Service And Maintenance page 45

SERVICE
If staius code recall is needed, briefly remove then reconnect one main limit _re to display last stored statL_s code. On RED LED boards de not remove power or blower dOOr before initiaing staius code recall.
LED CODE STATUS
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,
EACH OF THE FOLLOWING STATUS CODES IS A _ DIGIT NUMBER W1TH 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) -Blower runs for the
selected blower off-delay time, if unit is powered up during a calt for heat
(R-W/W1 closed) or (R-W/W1) opens during blower omdetay.
13 LIMIT CIRCUIT LOCKOUT - Lockout occurs if a limit, draft safeguard, flame rottout,
or blocked vent switch (if used) is open longer than 3 minutes.
- Coetrot wiit auto reset after three hours. - Refer to #33.
14 IGNITION LOCKOUT - Control wilt auto-reset after three hours. Refer to #34.
21 GAS HEATING LOCKOUT - Control wilt 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 wilt run until fault is cleared. Check for:
- Leaky gas valve - Stuck-open gas valve
23 PRESSURE SWITCH DID NOT OPEN Check for: - Obstructed pressure tubieg
- 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
Control relay may be defective, refer to status code #32
COMPONENTTEST
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" termieN.
Status LED wilt flash last status code and then turn ON the inducer motor. The inducer
motor wilt start ie HIGH speed and remain on HIGH speed untiI the end of the test then
shift to LOW speed for 7 to 15 seconds. The hot surface igniter, blower motor LO HEAT
speed, blower motor HI HEAT speed, and blower motor COOL speed wilt be turned ON for
10-15 seconds each. Gas Valve and Humidifier wilt not be turned on. When the blower is
turned OFF the inducer wilt be switched to tow-speed for 10 seconds.
32 LOW-HEAT PRESSURE SWITCH DID NOT CLOSE OR REOPENED - If open longer than
five minutes, ieducer shuts off for 15 mieutes before retry, If opens during blower on-delay
period, blower wilt come on for the selected blower off-delay. Check for:
- Excessive wind - Restricted vent - Defective inducer motor
- Proper vent sizing - Defective pressure switch - Low inducer voltage (115 VAC)
- Inadequate combustion air supply - Low inlet gas pressure (if LGPS used)
- Disconnected or obstructed pressure tubieg
33 LIMIT CIRCUIT FAULT - Indicates a limit, draft safeguard, flame rotteut, or blocked vent
switch (if used) is open, Blower wilt rue for 4 minutes or until open switch remakes
whichever is longer, If open teeger than 3 minutes, code changes to tockeut #13. If open
tess than 3 mieutes status code #33 continues to flash until blower shuts off. Flame rettout
switch and BVSS require manual reset, Check for: - Dirty filter or restricted duct system
- Defective blower meter or capacitor - Proper vent sizing - Restricted vent
- Defective switch or connections - Loose blower wheel - Excessive wied
- Inadequate combustion air supply (Flame Roll-out Switch open),
34 IGNITION PROVING FAILURE - Control wilt try three mere times before lockout #14 occurs,
If flame signal test durieg blower on-delay period, blower wilt come on for the selected
blower off-delay. Check for: - Oxide buildup on flame sensor (clean with fine steel wool)
- Proper flame sense microamps (.5 microamps D.C. min., 4.0 - 6.0 nominal)
- Manual valve shut-off - Coetrot ground continuity
- Gas valve defective or gas valve turned Off - Low ietet gas pressure
- Inadequate flame carryover Or rough ignition - Defective Hot Surface Ignitor
- Flame sensor must not be grounded
- Green/Yellow wire MUST be connected to furnace sheet metal
43 LOW-HEAT PRESSURE SWITCH OPEN WHILE HIGH-HEAT PRESSURE SWITCH IS
CLOSED - Check for: - Disconnected or obstructed pressure tubing
- Mis-wired pressure switches - Low-heat pressure switch stuck open
- Low inlet gas pressure (if LGPS used)
45 CONTROL CIRCUITRY LOCKOUT Auto-reset after oee hour lockout due to;
- Gas valve reIay stuck open - Flame sense circuit failure - Software check error
Reset power to clear lockout. Replace controt if status code repeats.
327598-101 REV. C
Fig. 51 - Service Label
P
J
A04210
Step 2 -- Care and Maintenance
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal
iniury, 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. Exposure to these
materials could lead to corrosion of the heat
exchanger.
CARBON MONOXIDE POISONING AND FIRE
HAZARD
Failure to follow this warning could result in personal
iniury, 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.
For continuing high performance and to minimize possible
furnace failure, periodic maintenance must be performed on this
furnace. Consult your local dealer about proper frequency of
maintenance and the availability of a maintenance contract.
ELECTRICAL SHOCK AND FIRE HAZARD
Failure to follow this warning could result in personal
iniury, death or property damage.
Before installing, modifying, or servicing system, main
electrical disconnect switch must be in the OFF position and
install a lockout tag. There may be more than one
disconnect switch. Lockout and tag switch with a suitable
warning label.
The minimum maintenance on this furnace is as follows:
1. Check and clean air filter each month or more frequently 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.
6. Inspect any accessories attached to the furnace such as a
humidifier or electronic air cleaner. Perform any service or
maintenance to the accessories as recommended in the ac-
cessory instructions.
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