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Mark SandovalAug 29, 2025
What to do for Limit High Li.h1 on Watlow Controller?
- LLinda HaleAug 29, 2025
If you are facing a Limit High (Li.h1) error on your Watlow Controller, check the cause of the over temperature.
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If you are facing a Limit High (Li.h1) error on your Watlow Controller, check the cause of the over temperature.
How to troubleshoot Watlow Controller no heat/cool action?
If your Watlow Controller isn't producing any heat or cool action, check these potential causes: * The output function might be set incorrectly; ensure it's set correctly. * The control mode might be set incorrectly; set it appropriately (Open vs Closed Loop). * The output could be wired incorrectly; correct the output wiring. * The load, power, or fuse might be open; correct the fault in the system. * The control set point might be incorrect; set the control set point in the appropriate control mode and check the source of the set point: remote, idle, profile, closed loop, open loop. * The controller model might be incorrect for the application; obtain the correct controller model for the application.
How to fix Alarm Error AL.E1 AL.E2 AL.E3 AL.E4 on Watlow Controller?
If you're seeing an Alarm Error (AL.E1 AL.E2 AL.E3 AL.E4) on your Watlow Controller, correct the wiring or replace the sensor.
How to fix Error Input Er.i1 on Watlow ez-zone pm Controller?
If you see Error Input Er.i1 on your Watlow Controller, correct the wiring or replace the sensor.
How to fix Limit Error Li.E1 on Watlow Controller?
If your Watlow Controller displays Limit Error Li.E1, correct the wiring or replace the sensor.
What to do if the limit won’t clear or reset on Watlow Controller?
If the limit on your Watlow Controller won’t clear or reset, correct the cause of the sensor input being out of the limit range.
What to do if Watlow ez-zone pm displays Device Error 100 rEtn?
If your Watlow Controller displays Device Error 100 rEtn, replace or repair the controller.
What does Ambient Error Er.ab mean on Watlow ez-zone pm?
If you encounter an Ambient Error Er.ab on your Watlow Controller, it indicates that the ambient error - cold junction circuitry is not working. Return it to the factory for repair.
Why does my Watlow ez-zone pm have no display?
If your Watlow Controller's display is blank, several factors could be the cause: * The controller might not be receiving power, so ensure it is turned on. * A fuse may have blown, requiring replacement. * The breaker could be tripped, needing a reset. * The safety interlock switch might be open, requiring closure. * A separate system limit control could be activated, requiring a reset. * There may be a wiring issue that needs correction. * The controller might be receiving incorrect voltage, so verify and apply the correct voltage, checking the part number to confirm.
Why is my Watlow Controller temperature running away?
A temperature runaway in your Watlow Controller can stem from several issues: * The controller output may be incorrectly programmed; verify that the output function is correct (heat or cool). * The thermocouple might be reverse wired; correct the sensor wiring, ensuring the red wire is negative. * The controller output might be wired incorrectly; verify and correct the wiring. * There could be a short in the heater; replace the heater. * The power controller connection to the controller may be defective; replace or repair the power controller. * The controller output might be defective; replace or repair the controller.
General| Model | EZ-ZONE PM |
|---|---|
| Input Types | Thermocouple, RTD, Process Voltage, Process Current |
| Output Types | Relay, SSR drive, voltage (0-10V), current (0-20mA, 4-20mA) |
| Display | LED |
| Power Supply | 100-240V AC |
| Communication Protocols | Modbus RTU, Ethernet/IP, DeviceNet |
| Agency Approvals | CE |
| Configuration | Front panel, PC software |
| Operating Temperature | 0°C to 55°C (32°F to 131°F) |
| Alarms | 4 configurable alarms with relay or logic outputs |
Explains safety symbols, notes, cautions, and warnings for safe operation.
Describes the controller's purpose, advanced PID, configuration software, and key benefits.
Provides physical dimensions and recommended panel spacing for various models.
Step-by-step instructions for mounting and connecting the controller.
Details wiring for Modbus, DeviceNet, EtherNet/IP, J1939, Profibus, and EIA-485.
Instructions for connecting the controller to a PC for configuration and monitoring.
Covers password protection, read/write lockout levels, and enabling security features.
Explains PID parameter tuning, autotune, manual tuning, and TRU-TUNE+ adaptive control.
Provides guidance on identifying and resolving common alarms, errors, and control issues.
Lists electrical, environmental, accuracy, agency approvals, and controller specifications.
