mypros+
Error code reference

Dacor Range Oven Cooktop Error Code L70

Communication error

Dacor codesDacor range oven cooktop codes

Communication error - loss of lower power board communication.

MyPros+ Max

Get the full diagnostic procedure for L70.

  • 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
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What L70 means on a Dacor range oven cooktop

The L70 error code on Dacor ranges and ovens indicates a communication failure between the main control board and the lower power board. These two boards work together to coordinate power delivery and control signals throughout the appliance. The lower power board is responsible for managing high-voltage functions in the lower oven cavity or base of the unit, and when the main control loses its data link to this board, it triggers the L70 fault to prevent unsafe or uncontrolled operation.

Communication between the control board and the lower power board typically travels over a dedicated wiring harness using a serial data protocol. A break anywhere in this signal path, including loose connectors, damaged wiring, or a failed board, will interrupt the communication and set this code. Voltage fluctuations or power surges can also corrupt the communication interface on either board, causing a persistent fault even after the surge has passed.

Because this error involves internal board-to-board communication rather than a simple sensor reading, it can be harder to diagnose without careful inspection of the wiring harness routing between the two boards. Technicians should inspect connector seats, check for pinched or chafed wiring, and verify that both boards are receiving proper supply voltage before condemning either component outright. A cold solder joint or failing capacitor on either board can also produce intermittent versions of this fault.

Source: manufacturer service documentation.

Common causes of L70

  1. 01

    Loose or disconnected wiring harness connector

    Wiring / connection

    The connector linking the main control board to the lower power board may have worked loose due to vibration or a previous service visit. Inspecting and reseating all connectors along this harness path is the first physical check to perform.

  2. 02

    Damaged or chafed wiring between boards

    Part replacement

    The harness routing between the two boards can develop shorts or open circuits if wires are pinched against sheet metal edges or have worn insulation. Carefully tracing the harness for visible damage or continuity breaks is essential.

  3. 03

    Failed lower power board

    Part replacement

    The lower power board itself may have failed due to a power surge, component degradation, or heat exposure, leaving it unable to respond to communication signals from the main board. If wiring checks out, the lower power board is the primary suspect.

  4. 04

    Failed main control board

    Part replacement

    Less commonly, the main control board may have lost the ability to transmit or receive communication signals, causing it to report a loss of contact with the lower board. This is typically considered after the lower board and wiring have been ruled out.

  5. 05

    Power surge or transient voltage event

    Wiring / connection

    A voltage spike can corrupt the communication circuitry on one or both boards without causing obvious physical damage. A hard reset may clear the fault if the surge was temporary, but repeated recurrence points to lasting board damage.

See the test procedure for each cause

Frequently asked questions about L70

What does L70 mean on a Dacor range, oven, cooktop?
The L70 code means the main control board has lost communication with the lower power board inside the appliance. This is an internal electronics fault that prevents normal operation. The cause is typically a wiring problem, a loose connector, or a failed board. The appliance will not function correctly until the communication link is restored.
Can I fix the L70 error myself, or do I need a technician?
Some cases of L70 are caused by a loose connector that a confident DIYer can reseat after disconnecting power. However, diagnosing a failed control board or tracing a damaged wiring harness inside a Dacor range typically requires disassembly and some technical knowledge. If a simple power reset does not clear the code, professional service is recommended to avoid misdiagnosis and unnecessary parts costs.
Is it safe to use my Dacor appliance while the L70 code is active?
It is not advisable to operate the appliance while the L70 fault is active. The error indicates that a key internal communication link has failed, which means the main control cannot reliably monitor or manage the lower power board. Continuing to use the unit could result in unpredictable behavior or unsafe conditions.
Will resetting the appliance clear the L70 error code?
A hard reset by cutting power at the circuit breaker for several minutes may clear the L70 code if the fault was caused by a temporary power surge or transient glitch. However, if the underlying cause is a failed board or damaged wiring, the code will return after reset. A reset that does not hold indicates a physical fault that needs hands-on repair.
How much does it cost to repair a Dacor L70 communication error?
Repair costs vary depending on the root cause. If only a wiring harness repair or connector reseating is needed, costs may be relatively modest, primarily covering a service call fee in the range of $80 to $150. If a lower power board or main control board replacement is required, parts and labor combined can range from $250 to $600 or more, depending on the specific model and local labor rates.

Related Dacor range oven cooktop codes

All Dacor range oven cooktop codes
View all 115 Dacor range oven cooktop codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass