WARNING WARNING CAUTION CAUTION WARNING
Contents
1. ee SERE D 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 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 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 31 PRESSURE SWITCH DID NOT CLOSE OR REOPENED If open longer than five minutes RED LED boards stored status codes can also be erased when power inducer shuts off for 15 minutes before retry Check for Excessive wind 115 VAC or 24 VAC to control is interrupted Proper vent sizing Defective inducer motor 12 BLOWER ON AFTER POWER UP 115 VAC or 24 VAC Blower runs for 90 seconds Low inducer voltage 115VAC Defective pressure switch if unit is powered up during a call for heat R W closed or R W opens during blower Inadequate combustion air supply Disconnected or obstructed pressure tubing on delay salt Low inlet gas pressure if LGPS used Restricted v2. result in personal injury or death Before servicing disconnect all electrical power and install lockout tag to furnace Verify proper operation after servicing 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 electrical supply to the furnace Check accessories and cooling unit for additional electrical supplies that must be shut off during furnace servicing Lockout and tag switch with a suitable warning label Verify proper operation after servicing A CAUTION ELECTRICAL OPERATION HAZARD Failure to follow this caution may result in improper furnace operation The electrical ground and polarity for 115 v wiring must be Label all wires pri r to disconnection when servicing properly maintained Refer to Fig 26 for field wiring information a and to Fig 41 for furnace wiring information controls Wiring errors can cause improper and dangerous operation NOTE If the polarity is not correct the STATUS LED on the control will flash rapidly and prevent the furnace from heating 43
3. VING 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 24 SECONDARY VOLTAGE FUSE IS OPEN Check for Short circuit in secondary voltage 24VAC wiring es COMPONENT TEST To initiate the component test sequence shut OFF the room thermostat or disconnect the R Gas valve defective or gas valve turned off Manual valve shut off thermostat lead Briefly short the TEST TWIN terminal to the Com 24V terminal Status LED Defective Hot Surface Ignitor Control ground continuity will flash code and then turn ON the inducer motor The inducer motor will run for the entire Low inlet gas pressure Inadequate flame carryover or rough ignition component test The hot surface ignitor blower motor fan speed on AMBER LED boards Green Yellow wire MUST be connected to furnace sheet metal only blower motor heat speed and blower motor cool speed will be turned ON for 10 15 45 CONTROL CIRCUITRY LOCKOUT Auto reset after one hour lockout due to seconds each Gas Valve and Humidifier will not be turned on Gas valve relay stuck open Flame sense circuit failure Software check error Reset power to clear lockout Replace
4. control if status code repeats C 327596 101 REV B A A04223 Fig 45 Service Label SERVICE AND MAINTENANCE PROCEDURES A CAUTION ENVIRONMENTAL HAZARD 4 WARNING FIRE EXPLOSION ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury death and or property damage Failure to follow this caution may result in environmental pollution Remove and recycle all components or materials i e oil refrigerant et before unit final disposal Step 1 Introduction The ability to properly perform maintenance on this equipment requires certain knowledge mechanical GENERAL skills tools and equipment If you do not possess these These instructions are written as if the furnace is installed in an do or attempt to perform any maintenance on this upflow application An upflow furnace application is where the he aa t other than those procedures recommended in blower is located below the combustion and controls section of the User s Manual the furnace and conditioned air is discharged upward Since this furnace can be installed in any of the 4 positions shown in Fig 4 ViN WARNING you must revise your orientation to component location accordingly ELECTRICAL SHOCK FIRE OR EXPLOSION ELECTRICAL CONTROLS AND WIRING TA A WARNING Failure to follow this warning could result in personal ELECTRICAL SHOCK HAZARD injury or death or property damage Failure to follow this warning could
5. ent 13 LIMIT CIRCUIT LOCKOUT Lockout occurs if the limit draft safeguard flame rollout or If it opens during blower on delay period blower will come on for the selected blower blocked vent switch if used is open longer than 3 minutes off delay Control will auto reset after three hours Refer to 33 33 LIMIT CIRCUIT FAULT Indicates a limit draft safeguard flame rollout or blocked vent 14 IGNITION LOCKOUT Control will auto reset after three hours Refer to 34 switch if used is open Blower will run for 4 minutes or until open switch remakes 21 GAS HEATING LOCKOUT Control will NOT auto reset whichever is longer If open longer than 3 minutes code changes to lockout 13 Check for Mis wired gas valve Defective control valve relay If open less than 3 minutes status code 33 continues to flash until blower shuts off 22 ABNORMAL FLAME PROVING SIGNAL Flame is proved while gas valve is de Flame rollout switch and BVSS require manual reset Check for Restricted vent eneraied eset run until fault is cleared Check for Leaky gas valve Proper vent sizing Loose blower wheel Excessive wind SUC open Gas Valve Dirty filter or restricted duct system 23 PRESSURE SWITCH DID NOT OPEN Check for a i i i ji Obstructed pressure tubing Pressure switch stuck closed Defective blower motor or capacitor Defective switch or connections Inadequate combustion air supply Flame Roll out Switch open 34 IGNITION PRO
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