You can pair up to three! Four if it is a T91/HTM100 ( I have two paired to mine)
T70:
The wireless Webasto-Telestart T70 unit enables Webasto heating units -
- Thermo Top, Thermo Top T, Thermo Top Z/C and Thermo Top E - to be switched on and
off from a distance of up to 600 m.
A mode change on the transmitter enables the vehicle fan for ventilating the vehicle
interior to be switched on and off in the same manner.
The receiver limits the operating time once the heater has been switched on by the
transmitter. Maximum coverage is achieved in open country. In built-up areas the range is
likely to be reduced. Each receiver can "learn" the codes of up to 3 transmitters.
T80:
Programming Telestart Transmitter
1. Place batteries into the battery compartment of the transmitter.
2. Remove fuse 1A (black) from the heater’s fuse holder (voltage interruption).
3. Wait at least 5 seconds.
4. Replace fuse in heater’s fuse holder and within 5 seconds press the OFF
button on the transmitter for at least 1 second.
5. "Learning" is completed.
A second or third hand-held transmitter can be programmed in the same manner.
NOTE:
The learning process can be repeated as often as necessary. The "oldest" transmitter
will be deleted each time.
T91:
Teaching In Telestart Transmitter for Thermo Top E and C
1. Insert the battery in the battery compartment of the transmitter.
2. Remove the 1 A fuse (black) from the heater's fuse holder (voltage interruption
of receiver).
3. Wait at least 5 seconds and refit the fuse.
4. After approximately 2 seconds, however within 6 seconds, press the OFF button
on the transmitter for at least 1 second.
5. Teaching is completed.
A maximum of 4 hand-held transmitters can be taught in this way. During additional
teaching processes, the "oldest" transmitter will be deleted each time.
HTM100:
Teaching in Telestart Transmitter for Thermo Top E and C
1. Insert the battery in the battery compartment of the transmitter.
2. Remove the 1 A fuse (black) from the heater's fuse holder (voltage interruption
of receiver).
3. Wait at least 5 seconds and refit the fuse.
4. After approximately 2 seconds, however within 6 seconds, press the OFF button
on the transmitter for at least 1 second.
5. Teaching is completed.
A maximum of 4 hand-held transmitters can be taught in this way. During additional
teaching processes, the "oldest" transmitter will be deleted each time.