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Error code reference
LG Heat Pump Error Code CH13
Problem in Solar-thermal sensor.
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What the CH13 error code actually means
Your LG heat pump is detecting a problem with the sensor that monitors the solar-thermal part of the system. The unit cannot get a reliable temperature reading from that sensor, so it has stopped normal operation to protect itself. A technician will need to check the sensor's wiring connection and test whether the sensor itself is still working correctly.
Diagnostic procedure
The full CH13 procedure
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1
First diagnostic step
Check if sensor is properly connected to PCB; measure resistance (5k ohm at 25°C unplugged) or voltage (2.5Vdc at 25°C plugged).
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Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.
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Most common causes of CH13
Ranked by how often they cause this code
- 1Loose or disconnected sensor connector at PCB
- 2Failed or degraded solar-thermal sensor
- 3Damaged wiring harness between sensor and PCB
- 4Moisture or corrosion at the sensor connector
- 5Faulty PCB input circuit
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Questions people ask about CH13
What does CH13 mean on a LG heat_pump?
CH13 indicates a problem detected in the solar-thermal sensor circuit on your LG heat pump. The PCB is not receiving a valid temperature signal from the solar-thermal sensor, either because the sensor has failed, the wiring is damaged, or the connector has come loose. The unit flags this code to prevent operating on inaccurate temperature data. Diagnosis involves checking the connector at the PCB and measuring sensor resistance or voltage against known good values.
Will resetting the heat pump clear the CH13 error?
A power reset may temporarily clear the CH13 code if it was triggered by a transient signal fault, but the error will return if the underlying cause is not corrected. If the sensor is truly failed, wiring is broken, or the connector is loose, the code will reappear shortly after restart. Resetting without diagnosis is not a lasting fix.
How much does it cost to repair a CH13 error on an LG heat pump?
Repair costs vary depending on the root cause. If only a connector needs reseating, the cost may be limited to a service call fee, typically in the range of $75 to $150. Replacing a faulty solar-thermal sensor generally adds parts and labor, bringing the total to roughly $150 to $400 depending on part availability and local labor rates. PCB replacement, if required, is the most expensive scenario and can range from $400 to $800 or more.
Can I fix CH13 myself, or do I need a technician?
Some causes of CH13 are accessible to a knowledgeable DIYer, such as reseating a loose connector at the PCB. However, safely accessing the PCB and sensor wiring, measuring the correct resistance and voltage values, and replacing components requires comfort working with electrical systems and disassembled heat pump cabinets. If you are not experienced with appliance electronics, a qualified technician is the safer choice.
Is it safe to run my LG heat pump with a CH13 error active?
Operating the heat pump while CH13 is active is not recommended. The solar-thermal sensor provides temperature data the system uses to manage the solar loop correctly, and running without a reliable reading can lead to inefficient operation or potential component stress. The unit may restrict operation automatically when this fault is present.
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