mypros+
Error code reference

LG Heat Pump Error Code t7

Error of high pressure sensor (OPEN/SHORT)

LG codesLG heat pump codes
Avg. service call
$285
National average. Trip fee plus diagnostic plus labor. Before parts.
MyPros+ 3-day pass
$9.95
Same diagnostic steps, on your phone. Start now.
You keep in your pocket
~$275
Even before you buy the part.
Skip the service call. Fix it yourself.
Full procedure unlocks instantly.
Get Started

What the t7 error code actually means

Your LG heat pump is showing an error because the sensor that monitors refrigerant pressure is sending a signal that falls outside the expected range, which usually means there is a wiring problem or the sensor itself has failed. The system detected this issue while the compressor was running and has stopped normal operation to protect the equipment. A technician will need to inspect the wiring and sensor to determine whether a repair or replacement is needed.

Diagnostic procedure

The full t7 procedure

Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.

MyPros+ · DiagnosticsStep 1 preview
1
First diagnostic step
Check sensor wiring and connector; skip detection during oil recovery, safety start, and defrost operations.
Unlock with pass
Unlock with pass
Unlock with pass
More steps, wiring diagram references, and verified part numbers
Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.
Unlock t7 procedure $9.95

Or subscribe: $29/month for unlimited access to all codes plus Max AI diagnostics.

Most common causes of t7

Ranked by how often they cause this code
  1. 1Loose or corroded sensor connector
  2. 2Damaged sensor wiring harness
  3. 3Failed high pressure sensor
  4. 4Control board input circuit fault

Most DIYers save hundreds by diagnosing before ordering parts.

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass

Questions people ask about t7

What does t7 mean on a LG heat pump?
The t7 code indicates an error in the high pressure sensor circuit. The control board detected a voltage signal below 0.4V (SHORT) or above 4.2V (OPEN) from the high pressure sensor while the compressor was running. This points to a wiring fault, a failed connector, or a defective sensor rather than an actual refrigerant pressure problem. The system flags this fault to protect the compressor from operating without valid pressure feedback.
Is it safe to run my heat pump with a t7 error?
Operating the unit while this fault is active is not recommended. The high pressure sensor provides critical protection data for the compressor, and running the system without a valid sensor signal removes an important safeguard against high pressure damage. It is best to address the fault before returning the unit to regular use.
Will resetting the unit clear the t7 error code?
A power reset may temporarily clear the code, but it will return as soon as the compressor runs again if the underlying sensor circuit fault has not been corrected. The fault detection is active during compressor operation, so any wiring issue or failed sensor will trigger the code again. A reset is useful for confirming whether the fault is intermittent, but it is not a repair solution.
Can I fix the t7 error myself?
A knowledgeable DIYer can inspect the sensor wiring harness and connector for visible damage, corrosion, or loose connections, and this is the recommended first diagnostic step. However, testing sensor voltage output and replacing refrigerant-side components typically requires proper tools and familiarity with heat pump electrical systems. If wiring inspection does not reveal an obvious problem, a qualified technician should perform further diagnosis.
How much does it cost to repair a t7 error on an LG heat pump?
Repair costs depend on what component has failed. A wiring repair or connector replacement is typically less expensive, often in the range of $75 to $200 including labor. Replacing the high pressure sensor itself usually costs between $100 and $350 depending on the part and labor rates in your area. A control board replacement, if needed, would be at the higher end of the cost range.

Related LG heat pump error codes

All LG heat pump codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass