A16
Beretta Safety Thermostat Chain Fault

A16 error; heater may not start or may shut down unexpectedly

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Open circuit in overheat thermostat chain, Loose wiring on safety thermostats, Faulty manual reset thermostat, Defective main PCB safety input

How to Fix / Troubleshooting

Safety: Never bypass safety thermostats. Isolate power before testing.

  • 1. Allow to cool: If the unit has overheated, wait until it is cool, then press any manual reset buttons on the overheat thermostats (if accessible).
  • 2. Visual wiring check: Inspect the wiring between the safety thermostats and the PCB for loose or burnt connectors.
  • 3. Continuity test (technician): With power off, a technician should test each thermostat for continuity. Replace any that are open and not resettable.
  • 4. PCB input check: If all thermostats and wiring are good, the main PCB safety input may be defective and require replacement.
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Repair Difficulty

Hard 4/5

Required Part

Overheat safety thermostat
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