Fujitsu Heat Pump Error 15: Thermistor Open/Short (Outdoor)
When your Fujitsu heat pump shows error 15, the control board is communicating that an outdoor unit temperature sensor has failed. This diagnostic code helps our technicians identify the problem quickly and accurately. BC Wide Home Services Ltd, doing business as BC Wide Heating & Air Conditioning brings years of experience with Fujitsu equipment and their proprietary error code system to every service call.
Diagnosing Fujitsu Error 15
Professional diagnosis of error 15 involves several steps. Our technicians begin by retrieving the stored fault code from the control board's memory, then systematically test each potential cause. This includes measuring electrical values with multimeters, checking sensor resistance readings, verifying gas pressure, inspecting wiring harnesses for damage, and testing components individually. BC Wide Home Services Ltd, doing business as BC Wide Heating & Air Conditioning uses manufacturer-recommended diagnostic procedures for all Fujitsu error codes.
How to Respond to Fujitsu Error 15
When you see error 15 on your Fujitsu system, start with these steps: Check that the power supply is on and stable. Verify the gas supply valve is open if applicable. Outdoor thermistor errors affect defrost cycle and performance. Professional replacement is needed. If the error persists or returns after resetting the system, professional diagnosis is recommended. Do not repeatedly reset the system without addressing the underlying cause, as this can lead to component damage or safety hazards.
Common Causes of Fujitsu Error 15
Error 15 on Fujitsu equipment can be caused by several factors. The most common causes include: failed thermistor, wiring damage, connector corrosion, sensor exposed to elements. BC Wide Home Services Ltd, doing business as BC Wide Heating & Air Conditioning technicians systematically test each potential cause to identify the root issue efficiently. The specific cause in your situation will depend on your system's model, installation configuration, and operating history.
What Error 15 Means on Your Fujitsu Heat Pump
Error 15 on Fujitsu heat pump systems indicates an outdoor unit temperature sensor has failed. This diagnostic code is generated by the system's control board when sensor readings or operating conditions fall outside the expected range. Fujitsu equipment uses sophisticated diagnostics to help technicians pinpoint problems accurately. The error code is stored in the control board's memory and can be retrieved even after the system has been reset.
Preventing Fujitsu Error 15 in the Future
Regular maintenance is the best way to prevent error 15 and other fault codes on your Fujitsu system. Annual professional maintenance includes cleaning the flame sensor, inspecting wiring connections, checking gas pressure, verifying proper airflow, and testing all safety controls. BC Wide Home Services Ltd, doing business as BC Wide Heating & Air Conditioning offers comprehensive maintenance programs for Fujitsu equipment. Well-maintained systems have fewer error codes and emergency service calls.
Safety Reminder
If you smell gas, suspect carbon monoxide or believe there is an immediate danger, leave the property and contact emergency services or the appropriate gas emergency authority. Do not remain inside — exit the building immediately and call for help from outside.