Sanyo STB1123C1, STB0823H1 If a sensor is defective. Only for heat pump model, Open, Short

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7-5. If a sensor is defective. (Only for heat pump model)

7-5-1. Room temp. thermistor (RTH) is defective.

A. Open

When thermistor opens, the air conditioner will be in the following conditions as the controller tries to detect extremely low room temperature.

a) In Cooling mode: The air conditioner soon stops and will not start again. (Thermo.OFF)

 

Compressor does not run.

 

b) In Heating mode: The air conditioner continues to operate. (Thermo.ON)

 

(Heat pump)

Electric heater does not stop.

 

 

As a result, the room becomes too warm.

Temperature

 

 

sensor

B. Short

 

Lead

wires

When thermistor is short, the air conditioner will be in the following conditions as the controller tries to detect extremely high room temperature.

Thermistor Structure

a)In Cooling mode: The air conditioner continues to operate. (Thermo.ON) Compressor does not stop.

As a result, the room becomes too cold.

b)In Heating mode: The air conditioner soon stops and will not start again. (Thermo.OFF)

(Heat pump)

Neither compressor nor electric heater runs.

NOTE Definition of Open or Short Circuit of Sensor (Thermistor)

Open... A lead wire is broken or disconnected or the circuit inside the temperature sensor is open .

Short... The protective cover of a lead wire has been damaged, and the exposed wire is touching another metal part, or both lead wires have become exposed and are touching each other. Alternatively, the circuit inside the temperature sensor is closed.

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Contents
Sanyo 26˝ Through the Wall AIR Conditioners & Heat Pump Please Read Before Starting HOW to USE this Manual ExampleTable of Contents Models STB0811C1 STB1023C1 STB1123C1 Operating RangeModels STB0810C1 STB1010C1 STB1020C1 STB1220C1 STB0823H1Specifications Unit SpecificationsModels STB0811C1 STB1023C1 STB1123C1 STB0823H1 Cooling & Electric Heating Heat PumpMajor Component Specifications CompressorPOW-STBH Other Component Specifications Room Thermostat YTB-2U136 YTB-2U358Dimensional Data Wall Sleeve Dimension Dimension of Wall OpeningRefrigerant Flow Diagram Model STB0823H1Performance Data Cooling Capacity10,200 BTU/h 700 BTU/h 11,500 BTU/h 000 BTU/h 500 BTU/h 11,300 BTU/h 980 810 650 490 300 070 22.8 100 Outdoor ambient temperature F DB Heating Capacity Heat pump PerformanceCooling only models Electrical CharacteristicsElectrical Data Cooling & electric heating models Heat pump model CoolingElectrical Wiring Diagrams Models STB0810C1 STB1010C1Models STB1020C1 STB1220C1 Model STB0811C1 Models STB1023C1 STB1123C1 Model STB0823H1 Layout for Electric Parts P.C.B. Assy Printed Pattern POW-STBH For model STB0823H1Check power supply TroubleshootingCheck before and after troubleshooting Check lead wires and connectorsAir conditioner does not operate Circuit breaker trips or fuse blowsNeither fan motor nor compressor motor runs Power is not suppliedCheck Mode selector on the control panel Check transformerElectric heater does not work Some part of air conditioner does not operateOnly fan does not run Check compressor and electrical parts Check setting temperatureOnly compressor unit does not run Cooling only models Cooling & electric heating modelsPoor cooling or heating Operation does not switch from Heat to Cool or Cool to HeatAir conditioner operates, but abnormalities are observed Excessive cooling or heatingOpen If a sensor is defective. Only for heat pump modelRoom temp. thermistor RTH is defective ShortMeasurement of Insulation Resistance Power Cord and UnitChecking Electrical Components Measurement of Insulation Resistance for Electrical PartsChecking Compressor Motor Winding Checking Motor CapacitorChecking Fan Motor Winding Checking ThermistorRemoving Wall Sleeve Disassembly ProcedureRemoving Front Grille Removing Electrical Component BoxRemoving Electric Heater Removing Blower Wheel Removing EvaporatorRemoving Condenser Removing Propeller FanRemoving Fan Motor Cooling Room Temperature ControlFunction Heating Heating Except during defrosting operation Heat Pump Model Model STB0823H1Defrosting Operation Heating Heat Pump Model Model STB0823H1 Defrosting FlowchartDefrosting Mode Timing Chart Appendix Heat Pump Model STB0823H1Fan Switch Sanyo Hvac Service Center
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