Manual HomeMatic HmIP-eTRV-B-UK (page 70 of 78) (English, German)

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Troubleshooting

9.3 Duty cycle

The duty cycle is a legally regulated limit of the

transmission time of devices in the 868 MHz range. The

aim of this regulation is to safeguard the operation of all

devices working in the 868 MHz range.

In the 868 MHz frequency range we use, the maximum

transmission time of any device is 1% of an hour (i.e. 36

seconds in an hour). Devices must cease transmission

when they reach the 1% limit until this time restriction

comes to an end. Homematic IP devices are designed

and produced with 100% conformity to this regulation.

During normal operation, the duty cycle is not usually

reached. However, repeated and radio-intensive teach-

in processes mean that it may be reached in isolated

instances during start-up or initial installation of a system.

If the duty cycle is exceeded, this is indicated by one long

red lighting of the device LED (B), and may manifest itself

in the device temporarily working incorrectly. The device

starts working correctly again after a short period (max.

1 hour).

9.4 Error codes and ﬂashing sequences

Flashing

code / LC

display

Meaning Solution

F1 Valve drive

sluggish Check whether the

valve pin is stuck.

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HomeMatic HmIP-eTRV-B-UK Manual

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