Full Gauge MT-543e plus
Four-output controller: each stage can cool or heat on its own set point, stage 3 can be a cyclic timer, stage 4 an alarm, plus a buzzer, soak (ramp) program and RS-485.
What it is: Four-stage temperature controller. The older MT-543Ri plus uses a different F numbering and is not covered here.
Key combo: Press ▲ and ▼ together to reach F01 (access code). Hold ▲ 2 s to silence the alarm/buzzer.
Full Gauge MT-543e plus error codes
| Display | Meaning |
|---|---|
| Err | Probe disconnected or reading out of range |
| OFF | Control functions switched off |
| LOC On / LOC OFF | Functions locked / unlocked |
| eCAL | Calibration fault: contact Full Gauge |
| PPPP | Settings need to be re-entered |
| inib | Alarm output or buzzer silenced from the quick menu |
How to enter service / parameter mode
- Set point: hold SET 2 s until SEt shows.
- Parameters: press ▲ and ▼ together, choose F01, press SET and enter the access code from the manual.
- Pick with ▲/▼, tap SET to view, change, tap SET to store. Hold SET until ---- to leave.
- Separate codes from the manual change the units and the probe type.
- The soak program is reached from the quick-access key (SOAK menu).
Parameter list
| Code | What it does | Range | Default / typical |
|---|---|---|---|
| F02 | Display offset | -5 to 5 °C | 0 |
| F03 | Stage 1: cooling (0) or heating (1) | 0 / 1 | 1 |
| F04 / F05 | Stage 1 lowest / highest set point | -50 to 200 °C | -50 / 105 |
| F06 | Stage 1 differential | 0.1–20 °C | 1 |
| F07 | Stage 1 restart delay | 0–999 s | 0 |
| F08 | Stage 2: cool or heat on SP2 (0/1) or on SP1 (2/3) | 0–3 | 0 |
| F09 / F10 | Stage 2 lowest / highest set point | -50 to 200 °C | -50 / 105 |
| F11 / F12 | Stage 2 differential / restart delay | 0.1–20 °C / 0–999 s | 1 / 0 |
| F13 | Stage 3: cool/heat on SP3, timer, minimum ventilation, cool/heat on SP1 | 0–5 | 0 |
| F14 / F15 | Stage 3 lowest / highest set point | -50 to 200 °C | -50 / 105 |
| F16 / F17 | Stage 3 differential / restart delay | 0.1–20 °C / 0–999 s | 1 / 0 |
| F18 | Stage 3 timer in seconds (0) or minutes (1) | 0 / 1 | 0 |
| F19 | Delay before the stage 3 timer starts | 0–999 s | 5 |
| F20 / F21 | Stage 3 timer on / off time | 0–999 | 0 / 0 |
| F22 | Timer mode (independent, linked to stage 1, etc.) | 0–5 | 0 |
| F23 | Buzzer: alarm inside band / outside band / outside band around SP1 | 0–2 | 1 |
| F24 / F25 | Buzzer lower / upper limit | -50 to 200 °C | -50 / 105 |
| F26 / F27 | Buzzer on / off time | 0–999 s | 1 / 1 |
| F28 | Buzzer block at power-up | 0–999 min | 0 |
| F29 | Buzzer re-arm time after silencing | Auto–999 min | Auto |
| F30 | Stage 4: cool/heat on SP4, alarm inside/outside band, around SP1, cool/heat on SP1 | 0–6 | 3 |
| F31 / F32 | Stage 4 lower / upper point | -50 to 200 °C | 21 / 27 |
| F33 / F34 | Stage 4 differential / restart delay | 0.1–20 °C / 0–999 s | 1 / 0 |
| F35 | Alarm block at power-up | 0–999 min | 0 |
| F36 | Alarm re-arm time after silencing | Auto–999 min | Auto |
| F37 / F38 | Alarm output on / off time | 0–999 s | 1 / 1 |
| F39 | Alarm delay | no–999 min | no |
| F40 / F41 | Probe filter mode / strength | 0–1 / 0–20 s | 0 / 0 |
| F42 / F43 | Lock mode / hold time to lock | 0–2 / 15–60 s | 0 / 15 |
| F44 | Who may switch control off | no–2 | no |
| F45 | Soak program on output 1 | 0 / 1 | 0 |
| F46–F55 | Soak points 1–5: temperature and hold time | -50 to 200 °C / 0–999 min | 23 °C / 0 |
| F56 | RS-485 address | 1–247 | 1 |
Notes
- Ranges are for the standard NTC probe in °C; the manual lists wider ranges for the optional probe type.
- The manual prints stage 1 default as 1 (heating).
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-543e plus 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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