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Fisher & Paykel·Dishwasherhigh severity
Fisher & Paykel Dishwasher Error Code A4
Water temperature control fault
Common Causes
- 1Control-module relay fault that cannot regulate heater output
- 2Temperature control circuit failure on the drawer module
Step-by-Step Troubleshooting
- 1
Verify the thermistor is healthy first, which rules out a bad sensor as the cause
- 2
With a good sensor, A4 points to the control module failing to regulate water temperature
- 3
A4 indicates a control-module relay fault requiring module replacement
- 4
Replace the drawer control module as a sealed unit rather than the sensor
- 5
Run a cycle afterward and confirm the water reaches and holds the target temperature
Pro Diagnostic Tip
A4 is a control-module fault in the temperature-control circuit — unlike a failed heater or a bad sensor, the drawer cannot regulate temperature even with a good element and thermistor. Rule out the sensor first, then replace the module.
You Might Also Notice
- •Wash water at the wrong temperature
- •No hot water despite a working element
- •Cycle faulting on temperature
- •Poor sanitisation results
Parts, Cost & Difficulty
Repair Difficulty
Professional OnlyEstimated Repair Cost
$240–$480
Parts + labor. Free diagnosis with repair.
Parts That May Need Replacement
Drawer control module
Do You Have the Right Tools?
Bearing puller set ($120), drum spider wrench ($85), multimeter ($85), and diagnostic software. Our technician arrives with $3,000+ in professional tools — your diagnostic is free.
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High-voltage components and pressurized water lines create flood and shock risk. A single loose fitting can cause thousands in water damage. Our techs are licensed and insured — let them handle the risk.
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Get Professional Help Now
Error code A4 is a high-severity issue that can cause further damage to your dishwasher if left unresolved. A licensed technician can diagnose and fix it the same day.
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Frequently Asked Questions
What does Fisher & Paykel error code A4 mean?
Fisher & Paykel error code A4 indicates: Water temperature control fault. This is a high-severity issue affecting your dishwasher.
How do I fix Fisher & Paykel error code A4?
Verify the thermistor is healthy first, which rules out a bad sensor as the cause Then, With a good sensor, A4 points to the control module failing to regulate water temperature Then, A4 indicates a control-module relay fault requiring module replacement There are 2 more steps — see the full troubleshooting guide above. This repair typically requires professional tools and expertise.
How do I know if my dishwasher has error A4?
Besides the error code on the display, common signs include: Wash water at the wrong temperature; No hot water despite a working element; Cycle faulting on temperature. If you notice any of these symptoms, check your dishwasher's display panel for error code A4.
How much does it cost to fix Fisher & Paykel A4?
Repair costs for Fisher & Paykel A4 typically range from $240 to $480 depending on the specific cause and parts needed. EasyBear offers free diagnosis when you proceed with the repair. Call (415) 795-7300 for a same-day appointment.
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