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  • Dometic/ Atwood 93866 RV Water Heater Thermal Cut-Off Kit
  • Dometic/ Atwood 93866 RV Water Heater Thermal Cut-Off Kit

Dometic

Dometic/ Atwood 93866 RV Water Heater Thermal Cut-Off Kit (ECO)

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$55.99
$39.80
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SKU:
93866
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Description

Dometic Atwood 93866 RV Water Heater Thermal Cut-Off Kit

The Dometic Atwood 93866 Thermal Cut-Off Kit is an OEM safety component used on a wide range of Atwood electronic-ignition RV water heaters. The thermal cut-off acts as a heat-sensitive safety fuse designed to shut the water heater down if excessive heat is detected outside the normal burner area.

If flame rollout, a blocked burner tube, insect nest, debris, or another abnormal combustion condition causes excessive heat near the thermal cut-off, the 93866 opens the electrical circuit and prevents continued water heater operation.

Models It Fits

The Atwood 93866 fits a large number of electronic-ignition Atwood and Dometic water heaters, including:

6 Gallon Models

  • G6A-2E

  • G6A-3E

  • G6A-4E

  • G6A-6E

  • G6A-7E

  • G6A-8E

  • GC6A-7E

  • GC6AA-7E

  • GC6AA-8E

  • GC6AA-9E

  • GC6AA-10E

  • GCH6-4E

  • GCH6-6E

  • GCH6-7E

  • GCH6A-7E

  • GCH6A-8E

  • GCH6A-9E

  • GCH6A-10E

  • GH6-3E

  • GH6-4E

  • GH6-6E

  • GH6-7E

  • GH6-8E

10 Gallon Models

  • G10-1E

  • G10-2E

  • G10-3E

  • G610-3E

  • GC10-1E

  • GC10-2E

  • GC10A-2E

  • GC10A-3E

  • GC10A-4E

  • GCH10A-2E

  • GCH10A-3E

  • GCH10A-4E

  • GH10-1E

  • GH10-2E

  • GH10-3E

  • GH10A-3E

  • GH610-3E

Atwood XT Models

The 93866 is also used on several Atwood XT water heaters, including:

  • G9-EXT

  • G16-EXT

  • GE9-EXT

  • GE16-EXT

  • GEH9-EXT

  • GEH16-EXT

Newer Dometic WH-Series Models

The same thermal cut-off is also listed for select newer Dometic water heaters, including:

  • WH-6GA

  • WH-6GEA

  • WH-9GEA

This makes the 93866 one of the more broadly used Atwood/Dometic water-heater safety components.

What the 93866 Thermal Cut-Off Does

The thermal cut-off is installed in the electrical circuit near the burner area.

Under normal operating conditions, electricity passes through the thermal cut-off to the water heater controls. If excessive heat reaches the device, the internal fuse opens and interrupts the circuit.

Once the thermal cut-off has opened, it cannot be reset and must be replaced.

Common Signs of a Failed Thermal Cut-Off

A blown 93866 may cause:

  • Water heater is completely unresponsive

  • No ignition attempt

  • No spark at the burner

  • Gas valve does not open

  • Water heater suddenly stopped working after previously operating normally

  • 12V power is present at the heater but does not pass through the thermal cut-off

A continuity test with a multimeter can usually determine whether the thermal cut-off has opened.

Why Did the Thermal Cut-Off Fail?

A failed thermal cut-off is often a symptom of another problem, not simply a defective fuse.

Common causes include:

  • Spider webs or insect nests in the burner tube

  • Debris restricting burner airflow

  • Dirty or partially blocked burner

  • Improper flame pattern

  • Flame rollout

  • Blocked exhaust area

  • Incorrect LP gas pressure

  • Burner alignment problems

If the replacement thermal cut-off fails again, the underlying combustion problem should be diagnosed before continuing to operate the water heater.

Thermal Rating

The Atwood 93866 is generally identified as a 190°F thermal cut-off used to protect the electronic ignition system from abnormal heat conditions.

Kit Contents

The OEM 93866 service kit is commonly supplied with:

  • 2 thermal cut-off devices

Having two in the package also provides a spare if another thermal event occurs after the initial repair.

Estimated Install Time

Approximately 5–15 minutes in most installations.

Tools Required

  • Basic hand tools

  • Multimeter

  • Needle-nose pliers if needed

Installation Notes

Before replacing the thermal cut-off:

  1. Turn off LP gas to the water heater.

  2. Disconnect 12V electrical power.

  3. Inspect and clean the burner tube and combustion area.

  4. Check for insect nests, debris, soot, or evidence of flame rollout.

  5. Install the replacement thermal cut-off in the same location as the original.

Do not bypass the thermal cut-off. It is an important safety device designed to shut the appliance down when excessive heat is detected.

Product Specifications

Manufacturer: Dometic / Atwood
Part Number: 93866
Part Type: Water Heater Thermal Cut-Off / Thermal Fuse
Temperature Rating: Approximately 190°F
Quantity: 2 Per Package
Application: Atwood and Dometic Electronic-Ignition RV Water Heaters
Fits: Many G6A, GC6, GCH6, GH6, G10, GC10, GCH10, GH10, XT and select WH-Series models

Important Fitment Note

The 93866 is used on an unusually broad range of Atwood electronic water heaters, including the very common GC6AA-10E, GCH6A-10E, GC10A-4E and GCH10A-4E, as well as several newer Dometic WH-series models.

Because Atwood produced many model revisions over the years, always verify the complete model number on the water heater data plate before ordering.

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