What to do if the compressor doesn’t turn on and “Y” LED is blinking on my Honeywell ERM5220R1018/U?
If the compressor on your Honeywell Remote Control isn’t turning on and the “Y” LED is blinking, it's likely due to a 5-minute compressor lockout after a power cycle. Please wait 5 minutes; the compressor will automatically turn on after this safety timeout.
Why is the connected LED on my Honeywell Remote Control red?
If the connected LED on your Honeywell Remote Control is red, it indicates a loss of communication with the system. Verify that the thermostat and/or Equipment Interface Module are powered and functioning correctly.
How to fix no LEDs on my Honeywell Remote Control?
If no LEDs are illuminated on your Honeywell Remote Control, it indicates that there is no power to the device. Verify that there is 24 VAC at the R/C terminals.
How to troubleshoot Honeywell Remote Control relays not switching as expected?
If the relays on your Honeywell Remote Control aren’t switching as expected, it may be due to an incorrect jumper configuration. Check the jumper configuration. If it is incorrect, unenroll from the system, change the jumper, and then re-enroll with the system.
Why is the outdoor temperature reading too high on my Honeywell ERM5220R1018/U thermostat?
If the outdoor temperature reading at the thermostat for your Honeywell Remote Control is too high, it's likely due to sun exposure on the sensor. Ensure the outdoor temperature sensor isn't in direct sunlight. You may need to use a longer wire to mount it in an ideal, shaded location.
What to do if my Honeywell ERM5220R1018/U thermostat shows “—” for outdoor temperature?
If your Honeywell Remote Control thermostat displays “—” for the outdoor temperature, it indicates that the wired outdoor temperature sensor has failed. Check the sensor for a short circuit or an open circuit.
Why is the connected LED off on my Honeywell ERM5220R1018/U Remote Control?
If the connected LED on your Honeywell Remote Control is off, it indicates that the device is not enrolled with the system. Enroll the device with the system.
Why is no outdoor temperature shown on my Honeywell ERM5220R1018/U thermostat?
If no outdoor temperature is shown on the thermostat for your Honeywell Remote Control, it could be because there is no wired outdoor temperature sensor connected to the ERM, or the device is configured as a boiler. Connect the outdoor temperature sensor to the S1/S1 terminals. Note that the device only reports outdoor temperature when configured as a compressor.
Why doesn’t the emergency backup control function on my Honeywell ERM5220R1018/U Remote Control?
If the emergency backup control isn’t functioning on your Honeywell Remote Control (when configured as a boiler), it indicates that there is no valid indoor temperature sensor. Check the sensor for a short circuit or open circuit, or install an indoor temperature sensor on the S1/S1 terminals.
Details wiring preparation and connection steps for the ERM device.
Guides the physical mounting of the ERM, including location and orientation.
Provides instructions on how to reset the ERM by holding the connect button.
General| Type | Remote Control |
|---|---|
| Model Number | ERM5220R1018/U |
| Brand | Honeywell |
| Category | Remote Control |
| Power Source | Battery |
| Battery Type | AAA |
| Number of Batteries | 2 |
| Display | LCD |
| Functions | Temperature control |
| Compatibility | Compatible with Honeywell thermostats |
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