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Error code reference

Jenn-Air Dishwasher Error Code E:27

Undervoltage fault; continuous undervoltage (<170V); programme ends.

Jenn-Air codesJenn-Air dishwasher codes

Undervoltage fault; continuous undervoltage (<170V); programme ends.

First step from the service manual

No appliance fault (check power supply voltage).

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What E:27 means on a Jenn-Air dishwasher

The E:27 error code on a Jenn-Air dishwasher indicates a continuous undervoltage fault, meaning the control board has detected incoming supply voltage below 170 volts AC for a sustained period. When this threshold is breached, the dishwasher's control system terminates the active wash programme as a protective measure to prevent damage to the motor, heating element, and electronic components that rely on stable voltage to operate within their designed parameters.

This fault originates outside the dishwasher itself. The appliance's control board monitors incoming line voltage and triggers E:27 when that voltage drops and remains below the 170V minimum. The most common sources are problems at the home's electrical supply level, including overloaded circuits, a weak or failing utility feed, loose wiring connections at the junction box or wall outlet, or a failing circuit breaker that is not maintaining a solid connection under load.

Because this is classified as a power supply issue rather than an appliance fault, the first diagnostic step is always to measure the actual voltage at the dishwasher's supply circuit using a multimeter. A reading consistently below 170 volts confirms the issue is upstream of the appliance. Voltage that fluctuates significantly during appliance operation may point to a shared circuit that is overloaded. Persistent low voltage at the meter panel level requires attention from a licensed electrician rather than an appliance technician.

Source: manufacturer service documentation.

Common causes of E:27

  1. 01

    Low or unstable household supply voltage

    Wiring / connection

    The utility feed to your home may be delivering voltage below the required minimum, particularly during peak demand hours. Use a multimeter at the outlet or junction box to confirm whether voltage is consistently below 170 volts.

  2. 02

    Overloaded branch circuit

    Wiring / connection

    If the dishwasher shares a circuit with other high-draw appliances, the combined load can drag voltage below the 170V threshold during operation. Check whether other devices are running on the same circuit breaker.

  3. 03

    Loose or corroded wiring connection

    Wiring / connection

    A loose connection at the wall junction box, terminal block, or circuit breaker can cause resistance in the supply line, resulting in voltage drop under load. Inspect all accessible connections for tightness and signs of heat damage or corrosion.

  4. 04

    Failing or weak circuit breaker

    Part replacement

    A circuit breaker that has worn contacts internally may pass adequate voltage at rest but fail to maintain it when current draw increases. If the breaker feels loose or has tripped multiple times, it may need replacement by a licensed electrician.

  5. 05

    Utility-side voltage sag

    Wiring / connection

    In some areas, the voltage delivered by the utility company can drop below acceptable levels during high-demand periods. Contact your utility provider if measurements at the main panel consistently show low voltage.

See the test procedure for each cause

Frequently asked questions about E:27

What does E:27 mean on a Jenn-Air dishwasher?
E:27 is an undervoltage fault indicating that the dishwasher's control board detected continuous supply voltage below 170 volts AC. As a protective response, the appliance terminates the current wash programme. This is a power supply issue, not a fault with the dishwasher's internal components. The first step is to measure the voltage at the supply circuit.
How do I fix the E:27 error on my Jenn-Air dishwasher?
Start by measuring the voltage at the dishwasher's supply outlet or junction box with a multimeter. If the reading is below 170 volts, check for overloaded circuits, loose wiring connections at the junction box or breaker panel, or a failing circuit breaker. If voltage at the main panel is also low, contact your utility provider. Persistent wiring or breaker issues should be addressed by a licensed electrician.
Is it safe to use my dishwasher when it shows E:27?
No, you should not attempt to force the dishwasher to run while the undervoltage condition exists. Operating motors and heating elements below their required voltage threshold can cause overheating and premature failure of components. Resolve the power supply issue before running the appliance again.
Will resetting my Jenn-Air dishwasher clear the E:27 error?
Resetting the dishwasher by cutting power at the breaker and restoring it may clear the displayed code temporarily, but the error will return if the underlying low-voltage condition is not corrected. The control board will detect undervoltage again as soon as a new cycle starts and supply voltage drops below 170 volts.
How much will it cost to fix the E:27 error on my Jenn-Air dishwasher?
Because E:27 points to the power supply rather than a dishwasher component, costs depend on what is found in your electrical system. Simple fixes like tightening a loose connection may cost very little, while replacing a circuit breaker typically runs between $75 and $200 including an electrician's labor. If the utility feed to your home needs attention, costs can vary widely depending on your provider's policies.

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