Full Gauge MT-512e 2HP
Flush-mount cooling or heating controller with a 2 HP relay, timed off-cycle defrost and a quick-access menu key.
What it is: Refrigeration temperature controller
Key combo: Press ▲ and ▼ together for F01 (access code). Hold ▼ 4 s for manual defrost; hold the menu key 5 s to switch control on/off.
Full Gauge MT-512e 2HP error codes
| Display | Meaning |
|---|---|
| Er1 | Probe disconnected or damaged |
| OFF | Control functions switched off |
| dEFr On / dEFr OFF | Defrost or cooling started by hand |
| LOC On / LOC OFF | Settings locked / unlocked |
| PPPP | Settings need to be re-entered (memory reset) |
| DEL / REFR / HOT / DEFR / ---- | Status view: start-up delay / cooling / heating / defrost / control off |
How to enter service / parameter mode
- Set point: hold SET 2 s until SEt shows, change with ▲/▼, press SET.
- Parameters: press ▲ and ▼ together (or pick F01 from the quick menu), tap SET and enter the access code from the manual.
- Pick a function with ▲/▼, tap SET to view and change, tap SET to store. Long-press SET until ---- to leave.
- The menu times out after 15 s idle and the code must be entered again.
- A second code from the manual selects °C or °F.
Parameter list
| Code | What it does | Range | Default / typical |
|---|---|---|---|
| F02 | Set point | -50 to 200 °C | 4 °C |
| F03 | Display offset | -5.0 to 5.0 °C | 0 |
| F04 / F05 | Lowest / highest user set point | -50 to 200 °C | -50 / 75 °C |
| F06 | Differential | 0.1–20.0 °C | 1.0 |
| F07 | Cooling (0) or heating (1) | 0 / 1 | 0 |
| F08 / F09 | Minimum on / off time of the output | no–999 s | 20 / 20 s |
| F10 | Cooling time between defrosts | 1–999 min | 240 min |
| F11 | Defrost time | no–999 min | 30 min |
| F12 | Start in cooling or defrost at power-up | 0 / 1 | 0 |
| F13 | Hold the display during defrost | no / yes | no |
| F14 | Start-up delay | no–240 min | no |
| F15 | Extra time on the first cycle | no–240 min | no |
| F16 | Compressor with a failed probe: off / on / cycle by F17–F18 | 0–2 | 0 |
| F17 / F18 | On / off time while the probe has failed | 1–999 min | 15 / 15 min |
| F19 | Probe filter | no–9 | no |
| F20 | Hold time to lock settings | no–60 s | no |
| F21 | Who may switch control off (0 = nobody, 1–4 locked/unlocked options) | no–4 | no |
Notes
- In heating mode a probe fault always switches the output off.
For licensed technicians only. This equipment can involve mains voltage, high-voltage microwave circuits, gas and refrigerant. Isolate power (and gas) before opening panels, follow the manufacturer's manual and your local licensing rules (for example ARC refrigerant handling and electrical or gas licences). Wrong settings can spoil food or damage equipment. Check every value on the unit in front of you before changing it.
Based on: Full Gauge MT-512e 2HP instruction manual. Always check the manual for your exact model and software version.
ServiceModes is not affiliated with Full Gauge or any other manufacturer. Written in our own words from the manufacturer's documentation.
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