Montague Oven Error Code Er02: Main and Display Board Link Lost
Er02 on the Montague V136EO-4I convection oven means the main board has lost communication with the display board. The manual says to check the 7-pin connector or breakout board for proper terminal connection and then contact a service provider.
Medium: the control cannot work properly while the boards cannot talk, but the manual gives no stop behavior.
What does Montague error code Er02 mean?
The oven control is built from two boards: a main board that runs the oven and a display board that you look at and press. They talk to each other over a cable. Er02 is the manual's message for when that conversation stops, that is, the main board has lost communication with the display board. The code is shown on the oven control display, so at least some of the display still works when you see it. The manual gives one cause, lost communication between the main board and the display board, and one check: look at the 7-pin connector or the breakout board for proper terminal connection. After that it directs you to a service provider. It does not state a reset for Er02, and it does not say what the oven does while the link is down, so we do not promise either. The check itself involves opening the control area, so it is not an operator step.
Affected models and control systems
Montague Legend electric range model V136EO-4I, convection oven only. Er02 is listed under Service, Error Codes on printed p. 12.
Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.
What you may notice
- Er02 on the oven control display
- Keys that do not respond or respond late
- A display that blanks or shows nothing sensible
Possible causes
Listed in Montague's documentation
- Lost communication between the main board and the display board
Other likely causes — what usually sits behind error code Er02 on this control. A technician confirms which one it is before any part is replaced.
- A 7-pin connector that has worked loose from vibration or door slams
- Terminals in the breakout board that have oxidized or backed out
- Heat in the control area that has weakened a contact over time
Safe checks before calling for service
- Turn off the oven at its breaker or switch and wait a minute before turning it back on.
- See whether the display returns to normal and Er02 is gone.
- Do not remove the control cover; the 7-pin connector is behind it.
- If Er02 stays, note whether the keys respond at all and whether the display flickers when the door is closed.
How a technician diagnoses error code Er02
- Confirm Er02 and ask what the keys and display do.
- With power isolated, remove the control cover and inspect the 7-pin connector for seating and bent or pushed-back terminals.
- Inspect the breakout board for burnt or loose terminals and re-seat each connection.
- Check continuity of each wire in the link with a meter.
- If the link tests good, replace the display board or main board in turn and confirm the code stays clear.
- The 7-pin connector and breakout board are in the control area, close to line voltage.
- Telling a bad cable from a bad board takes continuity tests and known-good parts.
- The manual sends this code to a service provider for the check.
How error code Er02 differs from similar codes
Er02 is a communication loss between boards. Er01 is circuit noise and Er03 is an invalid state on the main board alone.
Technical reference
- Document
- Montague Legend Electric Range, Operation Manual, Installation/Operations
- Edition
- No revision printed (file name: Final-Submission; listed on montaguecompany.com/manuals in 2026)
- Models / control
- Legend Electric Range model V136EO-4I (convection oven only)
- Section
- Service, Error Codes, printed p. 12
- Checked
- October 2026
We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.
Related Montague range error codes
Can I keep baking with Er02 showing?
The manual does not say what the oven does with this code, so we cannot promise it will bake normally. A service check is the safer step.
Is Er02 caused by the oven being too hot?
The manual does not say so. It names only the lost link between the two boards.
What does the 7-pin connector do?
The manual points to it as part of the link between the main and display boards, so a loose connection there is the first thing a technician checks.
Need help with Montague error code Er02?
A technician confirms the cause on site and gives you the price in writing before any work starts.