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Installation Guide
2. Dimensions and Wiring
Dimensions, see g. 4 on page 45. Wiring diagram.
Important – To avoid damage to Boiler and Thermostat, connect
only to OpenTherm connections on boiler, do not connect to any
other power source.
By connecting a volt free switch over terminals 1 & 2 you can pro-
vide an external override to enable a forced set back condition with
minimum 5 °C frost protection.
3. Error codes
Display Description
E1
Sensor Failure
EE
EEPROM Failure
Lo
Measured temperature below 0 °C
Hi
Measure temperature above 50 °C
E2
OT Communication Failure
Danfoss Climate Solutions
RET2001OT - V2
OpenTherm
OpenTherm
connections
connections
in RET2001OT
in RET2001OT
Set-back
Set-back
connections
connections
in RET2001OT
in RET2001OT
AN30483479654801-010102
A
OpenTherm
OpenTherm
B
connections
connections
in boiler
in boiler
Wires can
Wires can
be crossed
be crossed
External volt
1
External volt
free contactor/
free contactor/
2
switch
switch
EN
5
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