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Error code reference

Fisher & Paykel Dryer Error Code Err4

The heater and/or its related circuitry have malfunctioned (no change in temperature).

Fisher & Paykel codesFisher & Paykel dryer codes

The heater and/or its related circuitry have malfunctioned (no change in temperature).

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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
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What Err4 means on a Fisher & Paykel dryer

Err4 on a Fisher & Paykel dryer indicates that the heater circuit has failed to produce a measurable change in drum temperature during the heating cycle. The control board monitors temperature progression through a thermistor or thermal sensor. When the board expects a temperature rise within a defined window and detects none, it flags Err4 and halts the heating cycle to prevent potential hazards from a stuck relay or undetected fault.

The most common root causes involve the heater element itself, the high-limit thermostat, the thermal fuse, or the relay on the control board that switches power to the heater. A burned-out heating element will draw no current and produce no heat. A tripped or failed thermal fuse will interrupt power to the heater circuit entirely. A faulty high-limit thermostat can do the same. Any one of these failures will result in the temperature sensor reporting a flat reading, triggering Err4.

Wiring and connection integrity are also worth examining. A loose or corroded terminal at the heater element, thermal fuse, or thermostat can create an open circuit with the same effect as a failed component. Additionally, a defective temperature sensor itself could misreport a flat temperature even if the heater is operating normally, making sensor resistance verification an important step in the diagnostic process.

Source: manufacturer service documentation.

Common causes of Err4

  1. 01

    Failed heating element

    Part replacement

    The heating element has burned out and is no longer generating heat. This is the most common cause of Err4 and can be confirmed by checking the element for continuity with a multimeter.

  2. 02

    Blown thermal fuse

    Part replacement

    The thermal fuse is a one-time safety device that opens permanently if the dryer overheats. A blown thermal fuse cuts power to the heater circuit completely and will show no continuity when tested.

  3. 03

    Faulty high-limit thermostat

    Part replacement

    The high-limit thermostat can fail in an open position, interrupting power to the heater. Testing with a multimeter for continuity at room temperature will confirm whether it has failed.

  4. 04

    Defective control board heater relay

    Part replacement

    The relay on the control board that switches power to the heating element can fail, preventing the heater from receiving voltage even when commanded. This is less common but should be considered after ruling out the element and safety components.

  5. 05

    Faulty temperature sensor or open wiring

    Wiring / connection

    A defective thermistor or a loose, corroded connection in the heater circuit wiring can cause the control board to see no temperature change even if the heater is functional. Inspect terminals and verify sensor resistance is within specification.

See the test procedure for each cause

Frequently asked questions about Err4

What does Err4 mean on a Fisher & Paykel dryer?
Err4 means the dryer's control board detected no change in temperature during the heating cycle, indicating a malfunction in the heater or its related circuitry. The dryer monitors temperature rise during operation, and when that rise does not occur within an expected timeframe, it displays Err4 and stops the heating cycle. Common culprits include a failed heating element, a blown thermal fuse, or a faulty thermostat.
Can I fix Err4 on my Fisher & Paykel dryer myself?
Technicians and experienced DIYers can often resolve Err4 by testing and replacing components such as the heating element, thermal fuse, or high-limit thermostat using a multimeter. These parts are generally accessible once the dryer cabinet is opened. However, if the fault traces to the control board, professional repair is recommended due to the complexity and cost involved.
Is it safe to use my Fisher & Paykel dryer when Err4 is displayed?
When Err4 is active, the dryer has already stopped the heating cycle as a precaution, so the immediate risk of overheating is reduced. However, you should not attempt to bypass or ignore the error and continue operating the dryer. Running the dryer with a faulty heater circuit or compromised safety components could create a fire hazard or cause additional damage.
Will resetting the dryer clear the Err4 code?
A power reset may temporarily clear the Err4 display, but the code will return if the underlying fault in the heater circuit has not been corrected. The control board will trigger Err4 again as soon as it detects no temperature rise during the next heating cycle. A permanent fix requires diagnosing and replacing or repairing the faulty component.
How much does it cost to repair Err4 on a Fisher & Paykel dryer?
Repair costs depend on which component has failed. A replacement thermal fuse or thermostat typically costs between $10 and $40 for the part alone, while a heating element can range from $30 to $100 or more. If a control board replacement is needed, parts and labor combined can range from $150 to $400 or higher depending on the model and service rates in your area.

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