Carrier T--298 service manual Clearing Diagnostic Alarms, Inadequate Heat HEAT--PUMP

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	SYSTEM AND PROBABLE CAUSE			PROBABLE REMEDY

2.14 INADEQUATE HEAT (FREE--BLOW HEAT ONLY)

1.	No heat from heat strip.		1.	Verify AMP draw . ( 13.8 AMP)
				Verify resistance through heating element. (9 OHM)
				Check bi--metal switch. If open, replace switch.

2.15 INADEQUATE HEAT (HEAT--PUMP)

NOTE: Allow unit to operate 15 minutes after switch-
ing from cooling mode.
1.	Reversing valve not operating		1.	Check for 115 volts at reversing valve coil
			1.	Check for 115 volts at reversing valve coil
				Check for reversing valve restriction
2.	Outdoor coil icing.			Verify compressor operation
2.	Outdoor coil icing.		2.	Check outdoor coil sensor
			2.	Check outdoor coil sensor

Clearing Diagnostic Alarms

When a repair has been accomplished due to a corresponding alarm, the alarm must be cleared. This is done by disconnecting the 12 VDC power to the ducted ceiling assembly for one or two seconds. Once the 12 VDC power is reconnected, the alarm should have been cleared.

2-3

T--298

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Contents Model AirV AirV Maintenance Precautions Safety SummaryGeneral Safety Notices Operating PrecautionsSpecific Warnings and Cautions Specific Warning and Caution StatementsSafety 298 Table of Contents Table of Contents Figure Number List of FiguresTable Number List of TablesDesign Change Descriptions Section DescriptionIntroduction Serial Number IdentificationCeiling Unit Upper Unit RoofFor Part no Additional Support ManualsMANUAL--FORM no Equipment Covered Type of Manual Ceiling Unit Component Identification Free--Blow Component Identification -- Low Profile -- Upper Unit Component Listing--Ceiling Unit For Ducted Systems Return AIR Supply AIRFree Blow Type Refrigerant CYCLE--STANDARD System CationsSTART--UP Refrigerant Cycle -- Heat Pump Refrigerant Flow Schematic -- Heat Pump -- Cool Mode CoolingPage Section Troubleshooting Insufficient Cooling Heater Cycles on Limit Switch HEAT/ Cool Version onlyInsufficient COOLING, Cooling AIR not Adequate Condenser AIR not AdequateInadequate Heat HEAT--PUMP Clearing Diagnostic AlarmsPriority Malfunction Service -- General Section Service and MaintenancePreventative Maintenance Ceiling Grill -- Free Blow 3.3.3 Ceiling Panel Removal Indoor Thermostat 3.3.7 Air Sweep Removal Indoor Thermostat RemovalFilter Removal Control Box Assembly RemovalCeiling Unit -- Ducted Systems Fuse Removal Service -- Upper Unit -- STANDARD, HC & HPPCB Display Removal 15 Control Box Compressor Replacement19 Motor Assembly Upper Scroll Assembly Removal23 Blower Wheel Air Handling System RemovalLine Voltage -- 10% 27 Upper Scroll Assembly Locking Tabs b. & Screw Locations c 30 Condenser Fan Assembly Retaining Ring 34 Evaporator Motor Locking Tabs Condenser Motor RemovalFahrenheit Capacitor RemovalChange from Fahrenheit to Celsius will Be permanent. It cannot be changed back to38 Remote Control Components LCD Display SET Thermostat ConfigurationCheck Thermostat Operation Thermostat Powerbox AssemblyUpper Unit Ac to ry Wiri ng Fie ld Wiri ng Thermostat Powerbox AssemblyUpper Unit Schematic -- Standard & HC Section Wiring SchematicsCeiling Unit Schematic -- Cooling Only Heat Pump -- Ceiling Unit -- Free Blow Heat Pump -- Upper Unit -- Ducted Wall Mounted Thermostats 10 Ceiling Unit -- Wall Thermostat -- Ducted & Free BlowCeiling Unit -- Ducted Systems Ceiling Unit -- Free Blow Index