Masterbuilt Charcoal Grill Err 1 — What It Means & How to Fix It
Err 1 on a Masterbuilt Gravity Series 600 means the grill's temperature probe is not fully plugged in to the controller.
What this code means
The digital controller needs the grill temperature probe to run the fan. Masterbuilt's troubleshooting table lists the cause of Err 1 as "Temperature probe not fully plugged in" and gives two actions: check the connection is fully seated, then unplug the controller from power for ten seconds.
Masterbuilt's manual for the Gravity Series 600 (model MB20041023) lists "Err 1" in its troubleshooting table with this meaning. Masterbuilt's other grills and smokers have their own tables, so check the manual for your model number.
Most likely causes
| Cause | How likely | DIY-fixable? |
|---|---|---|
| Temperature probe plug not pushed fully home | Very common | Yes — no tools |
| Controller needs a power reset after reseating | Common | Yes — no tools |
What you can try yourself
- Find the temperature probe lead where it plugs into the controller and push it in until it is fully seated.
- Unplug the controller from its power supply, wait 10 seconds and reconnect it.
- Turn the grill on and check whether Err 1 has cleared.
When to call a technician
- Err 1 remains with the probe firmly plugged in and the controller reset.
- The probe lead is pinched, melted or cut.
Typical professional repair cost: Free in most cases. If the probe itself is damaged, Masterbuilt Customer Service can supply a replacement.
Frequently asked questions
How do I reset my Masterbuilt Gravity Series controller?
Unplug the controller from the power supply, wait 10 seconds and plug it back in. That is the reset the manual gives for Err 1.
Which probe does Err 1 refer to?
The grill's own temperature probe, not a meat probe. A meat probe malfunction is shown as Err 2.
Sources checked
Error meanings can vary by model. This guide was checked against the documentation above; use the manual for the model number on your own appliance when it differs.
Related Masterbuilt codes
- Masterbuilt Charcoal Grill Err 2 Err 2 on a Masterbuilt Gravity Series 600 means a meat probe has malfunctioned, and the manual sends you to Masterbuilt Customer Service.
- Masterbuilt Charcoal Grill Err 3 Err 3 on a Masterbuilt Gravity Series 600 means the grill has overheated, and the manual names a grease fire or a fan malfunction as the things to look for.
- Masterbuilt Charcoal Grill Err 4 Err 4 on a Masterbuilt Gravity Series 600 means the charcoal failed to ignite, and the manual gives a five-point checklist before you restart.
- Masterbuilt Charcoal Grill Err 5 Err 5 on a Masterbuilt Gravity Series 600 means a meat probe is reading above 300°F — hotter than it is meant to measure.
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