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Error code · Water Heater

GE GeoSpring PF/PH Code F36: T4 Sensor at the Compressor Outlet

F36 on 2025-and-newer GE Profile GeoSpring PF and PH series water heaters means the T4 sensor, at the compressor outlet, is reporting a failure. This sensor shows how hot the refrigerant is when it leaves the…

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Code
F36
Appliance
Water Heater
Brand
GE
Warranty
30-day workmanship

What F36 means

F36 on 2025-and-newer GE Profile GeoSpring PF and PH series water heaters means the T4 sensor, at the compressor outlet, is reporting a failure. This sensor shows how hot the refrigerant is when it leaves the compressor, which protects the compressor from overheating. If the reading cannot be trusted, the control may shut the heat pump down. You will probably notice slower heating and the electric elements running more.

Common causes of F36

  • T4 sensor and wiring connection
  • Lead routed near hot refrigerant line
  • Control board input for T4
✓ One safe check you can try

1. Note the code and the model number from the label. 2. Check that nothing blocks the air flow around the unit. 3. Never touch refrigerant lines or open the heat pump housing. 4. Call us to test the T4 sensor circuit, its lead and the plug.

! Why to stop there
  • T4 protects the compressor, so we do not run the heat pump without trusting the reading.
  • The sensor, lead and board input are checked in order.
  • Any repair price is given in writing first.
Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.
→Same appliance

Other Water Heater codes

F15GE GeoSpring First-Generation GEH50DEED Code F15: DataFlash memory error Attention! Tank not filled!GE GeoSpring GEH50DNSRSA Message "Attention! Tank not filled!": Fill before power Heat Pump FailureGE GeoSpring GEH50DXSRGA Message "Heat Pump Failure": Heat pump section problem Water Heater FailureGE GeoSpring GEH50DNSRSA Message "Water Heater Failure": Electric side problem System FailureGE GeoSpring GEH50DXSRGA Message "System Failure": Immediate attention Wiring to unit incorrectGE GeoSpring GEH50DNSRSA Message "Wiring to unit incorrect. Must be 240V not 120V": Supply check EPGE GeoSpring GEH50DXSRGA Code EP: Energy price signal F5, F6, F7, F8GE GeoSpring First-Generation GEH50DEED Codes F5-F8: Sensor failures
F36F36 questions
Why does the compressor outlet matter?

That is where the refrigerant is hottest. The control watches it so the compressor does not overheat, which is why a lost T4 reading can stop the heat pump.

Is F36 a compressor failure?

No. It points to the temperature sensor and not the compressor. A compressor problem is listed under a different code on this platform, so we confirm which one applies.

Will the heater still work?

Yes, through the electric elements, with higher running cost and slower recovery until the repair is done. We give you the price in writing before we start.

Book a visit

Still seeing F36?

A technician diagnoses it on site and gives you the price in writing before any work starts.

(713) 547-5545