Siemens Wireless Room Thermostat Transmitter and Receiver Set RDH100RF/SET

The Siemens RDH100RF/SET is a wireless room thermostat set made up of an RDH100RF transmitter with an LCD display and an RCR100/433 radio frequency receiver. It sits in the Siemens RDZ thermostats series and the Connected Home portfolio family. The transmitter reads room temperature and sends a switching signal at 433 MHz to the receiver, which in turn controls the heating circuit. The transmitter carries the same controller functionality as the wired RDH100, with TPI control.

• The boiler does not respond when the thermostat calls for heat, or the heating stays on regardless of the set temperature.
• The transmitter display is blank, faded or unreadable, or the unit fails to power up with fresh batteries.
• The receiver stops switching the heating circuit, or the operating mode indication no longer changes state.
• Communication between transmitter and receiver becomes intermittent, with the heating cutting in and out at random.
• The room temperature reading drifts noticeably from the actual room temperature, so the set point no longer holds.

• Confirm the appliance model against the compatibility list, as this set is listed for one Siemens thermostat application.
• Check the existing transmitter and receiver part references before ordering, and note the alternative number 4190282 where it appears on the old unit.
• Have 2 x AA 1.5V alkaline batteries ready for the transmitter, as these are the specified supply.
• The receiver is mains powered at AC 230 V with a switching voltage of 24 - 250 V AC, so isolate the heating supply before any wiring work and confirm the circuit is dead.