Assessments - 4, GPA: 4.3
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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 TWO DIGIT NUMBER WITH THE FIRST DIGIT DETERMINED BY THE NUMBER OF SHORT FLASHES AND THE SECOND DIGIT BY THE NUMBER OF LONG FLASHES. 320615-102 REV. K (LIT) A99233 Fig. 8—Service Label —8— 4. If furnace is operating properly and LED indicates proper operation, replace control access door. 5. Component Test can also be initiated by performing the following: a. Remove control access door. b. Remove blower access door. c. Manually close blower access door switch. WARNING: Blower access door switch opens 115-v power to control. No component operation can occur. Caution must be taken when manually closing this switch for service purposes. Failure to follow this warning could result in personal injury or death. d. BRIEFLY short (jumper) TEST, 3/16 in. quick connect terminal on control (adjacent to LED status light), and COM-24V terminal on furnace control thermostat terminal block. (See Fig. 6.) NOTE: If TEST to COM-24V terminals are jumpered longer than 2 sec, LED will flash rapidly, and test request will be ignored. e. Component Test will function as described in item 2 above. f. Check LED status. g. If LED status indicates proper operation, RELEASE BLOWER ACCESS DOOR SWITCH, replace blower access door, and replace control access door. WIRING DIAGRAMS Refer to Fig. 5, 6, and 7 for wiring diagrams. TROUBLESHOOTING Refer to service label. (See Fig. 8.) The Troubleshooting Guide can be a useful tool in isolating furnace operation problems. Beginning with the word “Start,” answer each question and follow the appropriate arrow to the next item. The Guide will help you identify the problem or failed component. After replacing any component, verify correct operation sequence. —9— Troubleshooting Guide START —10— Is circuit breaker closed? Close door switch and go to start. Is red LED status light on? Is door switch closed? Is red LED status light blinking rapidly without a pause? Is there 115v going to switch? Replace door switch. Replace control center. Replace transformer. Check for correct line voltage polarity. If units are twinned, check for proper low-voltage (24v) transformer phasing. Is there 115v at L1 and L2? Close circuit breaker and go back to start. Check for continuity in wire from circuit breaker to furnace. NO NO NO NO NONO YES YES YES YES YES YES NO YES Is there 24v at SEC-1 and SEC-2? Is red LED status light blinking ON/OFF slowly with a NO combination of short and long flashes? YES Determine status code. The status code is a 2 digit number with the first digit determined by the number of short flashes and the second digit by the number of long flashes. Check for previous fault by momentarily shorting the TEST terminal and the C terminal until the LED goes out. LED will flash the status code of any previous fault or the code No. 11 (1 short and 1 long flash) if no previous fault. After the control repeats the code 3 times, the control will go through a brief component test sequence. The inducer will start and run for the entire component test. The HSI, blower motor heat speed, and blower motor cool speed will run for 10-15 sec each. Check room thermostat or interconnecting cable. Was there a previous fault code other than No. 11? Does control respond to W, Y, or G 24-vac thermostat signals? Run system through a heating or cooling cycle to check operation. Status codes are erased after 48 hrs or whenever power (115v or 24v) is interrupted. Go to section with status code determined. YES YES NO Is 24 vac present at W, Y, or G terminals on the control? Replace control if it does not respond to 24-vac signal at W, Y, or G screw terminals. YES NO NO A99123a Unplug ignitor harness from controlcenter and inititate anothercomponent test sequence. CheckNO —11— 31 PRESSURE SWITCH WILLNOT CLOSE OR REOPEN - Ifopen longer than 5 minutes,inducer shuts off for 15 minutesbefore retry. Check for:• sag. •••••• • Check for:••• • only). • Dirty filter. • connections. • lockout, No. 14. ••• period? 11 NO PREVIOUS FAULT - Faultsare erased after 48 hrs orwhenever power (115v or 24v) isinterrupted. Run system througha heating or cooling cycle tocheck system. 12 BLOWER ON AFTER POWERUP (115V OR 24V) - Normal operation. Blower will run for 90sec when furnace power isinterrupted during a call for heat,R-W closed. 13 LIMIT OR FLAME ROLLOUTSWITCH LOCKOUT Limit switch was open longerthan 3 minutes. Auto-reset willoccur after 3 hrs. Flame rolloutswitch requires manual reset.See No. 33 14 IGNITION LOCKOUT - Systemfailed to ignite gas and proveflame in 4 attempts. Control willauto-reset in 3 hrs.See No. 34 21 GAS HEATING LOCKOUT Turn off power and wait 5minutes to retry. Check for: • Stuck closed gas valve relayon control. • Miswire or short to gas valvewire. 22 ABNORMAL FLAME...