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11 NO PREVIOUS CODE – Stored codes areerased after 72 hours. Run systemthrough a low-heat, high-heat, or coolingcycle to check system.12 BLOWER ON AFTER POWER UP –(115V OR 24V) – Normal operation.Blower runs for the selected blower offdelay,if unit is powered up during a callfor heat (R-W/W1 closed) or when (R-W/W1 opens) during the blower on-delayperiod.13 LIMIT CIRCUIT LOCKOUT – Lockoutoccurs if the limit or flame rollout is openlonger than 3 minutes. Control will autoresetafter 3 hours. See code 33.14 IGNITION LOCKOUT – System failed toignite gas and prove flame in 4 attempts.Control will auto-reset after 3 hours. Seestatus code 34.21 GAS HEATING LOCKOUT – Turn offpower and wait 5 minutes to retry. Checkfor:- Stuck closed gas valve relay on control.- Miswire or short to gas valve wire.22 ABNORMAL FLAME-PROVING SIGNALFlame is proved while gas valve is deenergized.Inducer will run until fault iscleared. Check for:- Stuck open or leaky gas valve.23 PRESSURE SWITCH DID NOT OPEN –Check for:- Obstructed pressure tube.- Pressure switch stuck closed.24 SECONDARY VOLTAGE FUSE IS OPENCheck for:- Short circuit in secondary voltage (24V)wiring including thermostat leads.Disconnect thermostat leads to isolateshort circuit.31 HIGH-HEAT PRESSURE SWITCH ORRELAY DID NOT CLOSE ORREOPENED - Check for:- Control relay may be defective.- Gas valve is miswired.- See status code 32.32 LOW-HEAT PRESSURE SWITCH DIDNOT CLOSE OR REOPENED – If opensduring blower on-delay period, blower willcome on for the selected blower off-delay.If open longer than 5 minutes inducershuts off for 15 minutes before retry.Check for:- Proper vent sizing.- Air leak between vestibule and blowercompartment.- Low inlet gas pressure (if LGPS used).- Disconnected or obstructed pressuretubing.- Defective or miswired pressure switches- Excessive wind.- Plugged condensate drain- Water in vent piping, possible saggingpipe- Restricted vent.- Defective Inducer motor.- Low inducer voltage (115 VAC)33 LIMIT CIRCUIT FAULT – Indicates thelimit or flame rollout is open. Blower willrun for 4 minutes or until open switchremakes whichever is longer. If openlonger than 3 minutes, code changes tolockout #13. If open less than 3 min.status code #33 continues to flash untilblower shuts off. Flame rollout requiresmanual reset. Check for:- Loose blower wheel.- Defective switch or connections.- Dirty filter or restricted duct system.- Improper gas input adjustment- Improper limit switch or no limit gasket.34 IGNITION PROVING FAILURE – If flameis not sensed during the trial for ignitionperiod, the control will repeat the ignitionsequence 3 more times before lockout #14occurs. If flame signal is lost during theblower on-delay period, blower will comeon for the selected blower off-delay.Check the following items first beforeproceeding to the next step.- Gas valve turned off.- Manual shut-off valve.- Green/Yellow wire MUST be connectedto furnace sheet metal.- Flame sensor must not be grounded.To determine whether the problem is inthe gas valve, igniter, or flame sensor thesystem can be operated in the componenttest mode to check the igniter. Firstremove the R thermostat connection fromthe control and initiate the component testsequence. Does the igniter gloworange/white by the end of the 15 secondwarm-up period?NOYES43 LOW-HEAT PRESSURE SWITCHOPEN WHILE HIGH-HEATPRESSURE SWITCH IS CLOSED -Check for:- Low-heat pressure switch stuckopen.- Disconnected or obstructedpressure tube.- Miswired pressure switches.- Low inlet gas pressure (if LGPSused).Unplug igniter harness from control andinitiate another component testsequence. Check for 115V between pin1 and NEUTRAL-L2 on the control. Was115V present for the 15 second period?NOYES45 CONTROL CIRCUITRYLOCKOUT Auto-resetafter 1 hour lockout dueto:- Flame circuit failure.- Gas valve relay stuckopen.- Software check error.Reset power to clearlockout. Replace controlif code repeats.Replace furnace control.Check for continuity in theharness and igniter. Replacedefective component.Reconnect the R thermostat lead and setthermostat to call for heat. Connectvoltmeter across gas valve connections.Does gas valve receive 24V?YESNOCheck connections. If OK,replace control.Check that all gas valves areturned on. Replace valve.Does gas valve open and allow gas toflow?YESDo the main burners ignite?YESNONOCheck for:- Inadequate flame carryoveror rough ignition.- Low inlet gas pressure.- Proper firing rate.Do the main burners stay on?NOYESAllow blower to come on andrepeat test to check forintermittent operation.Repeat call for heat and check flamesensor current during trial for ignitionperiod. Is the DC microamps below 0.5?YESClean flame sensor with fine steel wooland recheck current. Nominal current is4.0 to 6.0 microamps.NOCheck connections and retry.If current is near typical value(4.0-6.0 nominal) and burnerswill not stay on, repeat checkin high-heat. If burners willstill not stay on replacecontrol. If burners operate inhigh-heat then switch to lowheat,check manifoldpressure. If OK, checkburner carryover and flamesensor location.NOIs current near typical value? Replace electrode.YESNOWill main burners ignite and stay on? Replace furnace control.YESFixed.59TP5ATroubleshooting Guide (Cont)A11323B81