Error code · Professional Range

Monogram ZGP Range Code CX: Communication error

Medium · inspection needed

Code: CX
Appliance: Professional Range
Brand: Monogram
Warranty: 30-day workmanship

What CX means

CX is the communication error on Monogram ZGP professional gas ranges, among them the ZGP486ND and ZGP364ND. The oven control talks to several boards, and CX means a link to one of them is lost. The X is replaced by a number from 1 to 6 that names the board. The control keeps a record of the last communication errors and the last F codes. Guidance for the range is to check the harness first, then replace whatever board the number points to.

Common causes of CX

Harness between the control and the named board
Connector not seated at either end
The board named by the number after C
Control reading the link incorrectly

✓ One safe check you can try

1. Note the number that appears in place of the X. 2. Switch the oven controls off and leave the range idle. 3. Start a simple bake and see if the code returns. 4. If it does, call us with the full code, such as C1 or C4.

! Why to stop there

The number tells us the board but not whether the board or its harness has failed
We always check the harness and connectors first, as the guidance says
Stored codes are read by a technician in a service menu, not by owners

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

→Same appliance

Other Professional Range codes

C1Monogram ZGP Range Code C1: Main relay board link C2Monogram ZGP Range Code C2: Upper temperature encoder C3Monogram ZGP Range Code C3: Upper mode encoder C4Monogram ZGP Range Code C4: Auxiliary relay board link C5Monogram ZGP Range Code C5: Lower temperature encoder C6Monogram ZGP Range Code C6: Lower mode encoder SFMonogram ZGP Range Code SF: Special features menu ProdMonogram ZGP Range Code Prod: Factory test mode

CXCX questions

What does the number after C mean?

It names the board the control cannot reach. C1 is the main relay board and C4 is the auxiliary relay board, for example. Each has its own page.

Is the harness really the first suspect?

Yes. A pin that is not seated can look exactly like a dead board. We check the wiring and connectors before recommending a new part, which keeps the repair price lower.

Does the range remember older codes?

The control stores recent communication codes and F codes. We can read them during a visit to see whether the trouble is a repeat or a one-time event, and plan the repair from that.

Book a visit

Still seeing CX?

A technician diagnoses it on site and gives you the price in writing before any work starts.

(713) 955-0955