EPH Controls CP4 V2 Installation And Operation Manual page 58

LED Description
LED
System When the LED is RED the system is OFF.
When the LED is GREEN the system is ON.
Hub Solid White LED Indicating that the receiver is a HUB.
RF Solid White LED indicating that the thermostat is connected.
The RF light will double ash when the thermostat is disconnected. Check
thermostat pairing.
The RF light will blink intermittently when the system is sending and
Note:
receiving a signal for communication.
The RF light will blink once every second when in RF pairing by holding
Note:
Connect. Press Manual to exit from this state.
Opentherm® Solid White LED indicating that Opentherm® is connected.
The Opentherm® LED will blink when there is an Opentherm®
communication error.
58
Function
RF1B Wireless Receiver CP4
V2