TROUBLESHOOTING

PROBLEM

POSSIBLE CAUSE

TO CORRECT

 

Power disconnected.

Check power source.

 

System switch in “Off” position.

Set switch correctly.

 

Branch circuit fuse blown or

Replace fuse, reset breaker. If repeats, check fuse or breaker

UNIT DOES NOT RUN.

circuit breaker tripped.

size. Check for shorts in unit wiring and components.

Inoperative system switch.

Test for continuity.

 

 

Loose or disconnected wiring

Check wiring and connections.

 

at switch.

Connect per wiring diagram.

 

Inoperative switch (On-Off).

Test for continuity, 3 and 2, 5 and 6.

 

 

 

 

Dirty Filter.

Clean as recommended in Owner’s Manual.

 

Restricted air flow.

Check for dirty or obstructed coil - clean as required.

 

Inoperative thermostat.

Test for shorted thermostat or stuck contacts.

EVAPORATOR COIL

Short of refrigerant.

De-ice coil and check for leak.

FREEZES UP.

 

 

 

De-ice coil. Check temperature differential across coil. Touch

 

 

 

Partially restricted capillary.

test coil return bends for same temperature. Test for low

 

 

running current.

 

Inoperative fan motor.

Test and replace if inoperative.

 

 

 

 

Excessive heat load.

Test cooling performance of unit. Unit undersized.

 

Restriction in line.

Check for partially iced coil. Check temperature split across

COMPRESSOR RUNS

coil.

 

 

Check for presence of oil on silver soldered connections.

CONTINUALLY.

Refrigerant leak.

DOES NOT CYCLE OFF.

Check for partially iced coil. Check split across coil. Check for

 

low running amperage.

 

 

 

Thermostat contacts stuck.

Check operation of thermostat. Replace if contacts remain

 

closed.

 

 

 

 

 

 

Loss of charge in thermostat

Place jumper across thermostat terminals. If unit operates,

 

bulb.

replace thermostat.

THERMOSTAT DOES

Loose or broken parts in

Check as above.

NOT TURN UNIT ON.

thermostat.

 

 

Incorrect wiring.

Connect per wiring diagram.

 

System switch open.

Test for continuity at switch terminals 2 and 3.

 

 

 

 

Thermostat set at coldest point

Turn to highest temperature setting to see of unit will cycle off.

THERMOSTAT DOES

Thermostat contacts stuck.

Disconnect power to the unit. Remove cover of thermostat

and check if contact is stuck, if so replace thermostat.

NOT TURN UNIT OFF.

 

Switch (On - Off) shorted.

Test switch for open contacts at terminals 2 and 3 with switch

 

 

in “Off” position.

 

 

8

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Friedrich SH20L30-B, SH15L30-B manual Troubleshooting Problem Possible Cause To Correct, Unit does not RUN
Page 7 Page 9

SH15L30-B, SH20L30-B specifications

The Friedrich SH20L30-B and SH15L30-B are cutting-edge HVAC systems designed to provide superior climate control for residential and commercial applications. These models are engineered with the latest technologies to ensure efficient operation, reliability, and convenience.

The SH20L30-B model boasts a significant cooling capacity of 20,000 BTU, making it an ideal choice for larger spaces. In contrast, the SH15L30-B has a cooling capacity of 15,000 BTU, suitable for medium-sized areas. Both units are designed with energy efficiency in mind, featuring advanced inverter technology that optimizes power consumption while maintaining consistent temperature control.

One of the standout features of these models is their multi-stage filtration system. This system effectively removes dust, allergens, and other particulates from the air, promoting a healthier indoor environment. The units are equipped with a washable pre-filter and an activated carbon filter that enhances air quality by reducing odors and harmful volatile organic compounds (VOCs).

Both the SH20L30-B and SH15L30-B are equipped with smart technology capabilities, allowing users to control the systems via mobile applications. This feature provides convenience for users who want to adjust the settings remotely, monitor energy usage, and receive maintenance notifications. Additionally, these models are compatible with popular voice control systems, integrating seamlessly into modern smart home setups.

Noise reduction technology is another key characteristic of the Friedrich SH series. Both units operate at whisper-quiet levels, ensuring minimal disturbance even during peak operation. This makes them suitable for various environments, including bedrooms, offices, and other quiet spaces.

Durability and reliability are priorities in the design of the SH20L30-B and SH15L30-B. Featuring robust construction materials and advanced engineering, these systems are built to withstand the rigors of everyday use. The corrosion-resistant components contribute to their long lifespan, ensuring that users can rely on them for years to come.

In conclusion, the Friedrich SH20L30-B and SH15L30-B combine powerful performance with innovative technologies. Their energy efficiency, advanced filtration system, smart technology integration, and quiet operation make them an excellent choice for anyone seeking effective climate control solutions. Whether for residential or commercial use, these units demonstrate Friedrich's commitment to delivering high-quality, dependable HVAC solutions.
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