Siemens RDF300 Room Thermostat Service Level Parameters Explained Diagnostics and Test Functions Part 1

In this article, you'll learn the Siemens RDF300 Room Thermostat Service Level parameter settings, including a detailed explanation of the Diagnostic & Test functions Part-1

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This guide is designed for Building Automation Engineers, HVAC Technicians, Commissioning Engineers, Facility Managers, Service Engineers, System Integrators, and Engineering Students who want to understand the thermostat's configuration parameters and their practical applications.

Siemens RDF300 Parameter Settings for HVAC Engineers

Throughout this article, every parameter is explained in simple language with practical examples, supported models, factory settings, adjustment ranges, and important notes to help you configure the thermostat correctly.
Whether you're commissioning a new HVAC installation or troubleshooting an existing system, this guide provides a practical reference for the Siemens RDF300 series.

⚠️ Disclaimer-1

This article has been prepared for educational and informational purposes. Some content was refined with the assistance of AI for grammar, readability, and organization. The technical information, parameter settings, wiring details, and explanations have been researched and verified by the author using official Siemens documentation and other reliable technical references. Always verify parameter settings and wiring before commissioning equipment, as requirements may vary depending on the application and drive version.

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Introduction

Several control parameters can be adjusted to optimize the controller's performance.
These settings can be changed while the controller is operating, without opening the unit.
All parameter settings are automatically saved and retained even after a power failure.

The control parameters are divided into two levels:

Service Level
Expert Level (includes Diagnostic and Test functions)

The Service Level contains the most commonly used parameters for configuring the HVAC system and adjusting the user interface. These settings can usually be changed at any time.
The Expert Level contains advanced parameters that affect the controller's operation and performance. These settings should only be changed carefully, as incorrect values may affect the controller's functionality.
The Expert Level parameter settings are covered in a separate blog post.

Service Level

These parameter settings are applicable to the RDF300, RDF600, RDF340, RDF400, and RDF600T thermostat models.
However, most parameters are supported by all the models listed above.
Only a few parameters are not supported by certain models, as indicated throughout the parameter settings.

Parameter P01 – Control Sequence

Parameter	P01
Description	Control Sequence
Factory Setting	2-pipe, single duct [0 to 3] 1 (Cooling only) 4-pipe, [2 to 4] 4 (Heating & Cooling)
Setting Range	0 = Heating only 1 = Cooling only 2 = Manual H or C 3 = Auto Changeover 4 = Heating & Cooling

P01 is used to select how the thermostat controls the HVAC system, such as heating only, cooling only, manual heating/cooling, automatic changeover, or heating and cooling.

Parameter P02 – Operating Mode Selection

Parameter	P02
Description	Mode selection by user via operating mode button
Factory Setting	1 (Stb, Comf)
Setting Range	1 = Stb,Comf 2 = Stb, Comf, Eco

P02 is used to select which operating modes are available when the user presses the thermostat's mode button.

Setting 1: Standby (Stb) and Comfort (Comf) modes only.
Setting 2: Standby (Stb), Comfort (Comf), and Economy (Eco) modes.

Note

P02 is not available when the controller is commissioned for manual heating/cooling changeover P01=2.
Parameter display depends on selected application and function.

Parameter P04 – Temperature Unit

Parameter	P04
Description	Selection of °C or °F
Factory Setting	°C
Setting Range	°C or °F

P04 lets you choose whether the thermostat displays the temperature in Celsius (°C) or Fahrenheit (°F).

Parameter P05 – Sensor Calibration

Parameter	P05
Description	Sensor Calibration
Factory Setting	0.0 K
Setting Range	-3 to +3 K

P05 is used to adjust the temperature sensor reading if it differs from the actual room temperature, you can apply an offset from –3 K to +3 K (equivalent to –3°C to +3°C).

👉For Example:

Thermostat displays 24°C, but the actual room temperature is 25°C → Set P05 = +1 K.
Thermostat displays 26°C, but the actual room temperature is 25°C → Set P05 = –1 K.
Kelvin (K) is the standard unit for expressing a temperature difference or offset, Since 1 K = 1°C for temperature changes.

Parameter P06 – Standard Temperature Display

Parameter	P06
Description	Standard Temperature display
Factory Setting	0 (Room Temp.)
Setting Range	0 = Room Temperature, 1 = Setpoint,

P06 is used to select what the thermostat displays during normal operation: the current room temperature or the temperature setpoint.

👉For Example:

0 = Display the room temperature.
1 = Display the temperature setpoint.

Parameter P07 – Additional User Information

Parameter	P07
Description	Additional user information
Factory Setting	0 (No Display)
Setting Range	0 = No display 1 = Temperature in °C / °F

P07 is used to select the additional information displayed on the thermostat screen during normal operation.

👉For Example:

0: Only the normal display is shown (no additional temperature information).
1: The thermostat can display the temperature in both 25°C and 77°F, allowing users to view both units.

Note: The P07 parameter setting is not available on the RDF400 and RDF600T thermostat models.

Parameter P08 – Comfort Setpoint

Parameter	P08
Description	Comfort basic Setpoint
Factory Setting	21 °C
Setting Range	5 to 40 °C

P08 is used to set the default Comfort mode temperature for the thermostat.
If P08 is set to 24°C, the thermostat will use 24°C as the default temperature when operating in Comfort mode.

Note:

Changing P08 only changes the default Comfort mode setpoint.
Users can still adjust the temperature within the allowed minimum and maximum limits (if configured by other parameters).

Parameter P09 – Minimum Comfort Setpoint

Parameter	P09
Description	Minimum Setpoint limitation in comfort (W-Min comfort)
Factory Setting	5 °C
Setting Range	5 to 40 °C

P09 is used to set the lowest temperature that can be selected in Comfort mode.
If P09 is set to 18°C, the user cannot decrease the Comfort mode temperature below 18°C.

Note:

This parameter only limits the minimum Comfort mode setpoint.
It does not affect the actual room temperature or the thermostat's control performance.

Parameter P10 – Maximum Comfort Setpoint

Parameter	P10
Description	Maximum Setpoint limitation in comfort (W-Max comfort)
Factory Setting	35 °C
Setting Range	5 to 40 °C

P10 is used to set the highest temperature that can be selected in Comfort mode.
If P10 is set to 28°C, the user cannot increase the Comfort mode temperature above 28°C.
P10 only limits the maximum Comfort mode setpoint. It does not affect the actual room temperature or the thermostat's control performance.

Parameter P11 – Economy Heating Setpoint

Parameter	P11
Description	Setpoint of heating in Economy mode (W-heat Eco)
Factory Setting	15 °C
Setting Range	OFF, 5 °C W-cool Eco

P11 is used to set the heating temperature when the thermostat operates in Economy mode.

👉For Example:

If P11 is set to 18°C:

When the thermostat switches to Economy mode, it will maintain a minimum room temperature of 18°C.
If the room temperature falls below 18°C, the heating will turn ON.
Once the room reaches 18°C, the heating will turn OFF.

If P11 = OFF:

The Economy heating function is disabled.
The thermostat will not maintain a minimum heating temperature in Economy mode.

The P11 value must be lower than or equal to the P12 (Cooling setpoint for Economy mode) to ensure proper thermostat operation.

Parameter P12 – Economy Cooling Setpoint

Parameter	P12
Description	Setpoint of cooling in Economy mode (W-cool Eco)
Factory Setting	30 °C
Setting Range	OFF, W-heat Eco 40 °C

P12 is used to set the cooling temperature when the thermostat operates in Economy mode.

👉For Example:

If P12 is set to 28°C:

When the thermostat is in Economy mode, cooling will turn ON if the room temperature rises above 28°C.
Once the room temperature drops to 28°C, the cooling will turn OFF.

If P12 = OFF:

The Economy cooling function is disabled.
The thermostat will not provide cooling in Economy mode.

The P12 value must be greater than or equal to the P11 (Heating setpoint for Economy mode) to ensure proper thermostat operation.

Parameter P13 – Electrical Reheater

Parameter	P13
Description	Electric reheater for cooling mode
Factory Setting	ON
Setting Range	OFF = Disabled ON = Enable

P13 is used to enable or disable the electrical reheater when the thermostat is operating in cooling mode.

ON = Enabled – The electrical reheater can operate during cooling mode when required.
OFF = Disabled – The electrical reheater will not operate during cooling mode.

👉For Example:

Imagine a room that needs cooling but the air becomes too cold:

If P13 = ON, the thermostat can use the electrical reheater to slightly warm the cooled air and maintain a comfortable room temperature.
If P13 = OFF, the electrical reheater remains disabled during cooling mode.

Siemens RDF300 HVAC Thermostat Service Menu

Note

This parameter is mainly used in HVAC systems equipped with an electrical reheater.
If the system does not have an electrical reheater, this parameter has no effect.

Parameter P14 – Button Lock

Parameter	P14
Description	Button Lock (press operating mode button for 7 seconds to lock or unlock the button)
Factory Setting	0 (Disable)
Setting Range	0 = Disabled 1 = Auto Lock 2 = Manual Lock

P14 is used to lock or unlock the thermostat buttons to prevent unauthorized or accidental changes.

0: The user can freely adjust the temperature and operating mode.
1: The thermostat automatically locks the keypad after a short time to prevent accidental changes.
2: The keypad stays locked until the user unlocks it manually.

Note

To enable or disable the key lock🔐

The RDF300, RDF340, and RDF400 models: Press and hold the Operating Mode button for 7 seconds.
The RDF600 and RDF600T model: Press and hold the Operating Mode button for 3 seconds.

Diagnostic & Test

d01 Application

Parameter	d01
Description	Application
Factory Setting	Diagnose
Setting Range	2P:= 2-pipe, 2PEL:= 2-pipe & el. heater, 4P:= 4-pipe, 2P3P:= 2-pipe 3pos,

d01 displays the current HVAC application (system type) configured in the thermostat. This is a diagnostic parameter and cannot be changed.

2P = 2-pipe system
2PEL = 2-pipe system with electrical heater
4P = 4-pipe system
2P3P = 2-pipe system with a 3-position actuator

👉For Example:

If d01 displays 4P, it means the thermostat is configured to control a 4-pipe heating and cooling system.

Note

d01 is a diagnostic parameter for viewing only.
It displays the current application type but cannot be modified in the Diagnostic & Test menu.

d02 Status Input X1

Parameter	d02
Description	Status input X1
Factory Setting	Diagnose
Setting Range	0:= Digital input not activated, 1:= Digital input activated 0…49 °C = measured temp. value, 00 := H/C input short, 100:= H/C input open,

d02 displays the current status of input X1. It is a diagnostic parameter used to check whether the input is active and to monitor its condition.

👉For Example:

0 = Digital input not activated
1 = Digital input activated
0...49°C = Measured temperature from the connected sensor (if 24°C, the thermostat is reading a 24°C temperature from the sensor connected to X1)
00 = Heating/Cooling input short circuit
100 = Heating/Cooling input open circuit (sensor disconnected or broken)

Note

d02 is a diagnostic parameter for monitoring the X1 input only.
It is used to check the status of the connected input or sensor and cannot be used to change any settings.

d03 Status Input X2

Parameter	d03
Description	Status input X2
Factory Setting	Diagnose
Setting Range	0:= Digital input not activated, 1:= Digital input activated 0…49 °C = measured temp. value, 00:= H/C input short, 100:= H/C input open,

d03 displays the current status of input X2. It is a diagnostic parameter used to check whether the X2 input is active and to monitor its condition.
d03 has the same functions and display values as d02, but it monitors the X2 input instead of the X1 input.

d05 Actuator Direction Test

Parameter	d05
Description	Test mode to check the 3-position Y11/Y21 actuator direction. Note that this parameter can be quit only if the setting is back at --- and by pressing + and – buttons.
Factory Setting	Diagnose
Setting Range	“---” := no signal OPE:= Y11 active (open) CLO:= Y21 active (close)

d05 is a diagnostic test used to check whether the 3-position actuator opens and closes in the correct direction.

--- = No signal (test mode is inactive)
OPE = Y11 output is active → The actuator opens
CLO = Y21 output is active → The actuator closes

You can exit the test mode only by setting the parameter back to --- and pressing the + and – buttons together.

This parameter is for testing only and is mainly used during installation, commissioning, or troubleshooting of 3-position actuators.

Factory Reset Procedure

The factory settings for the control parameters can be reloaded via parameter P71, by changing the value to ON, and confirming by pressing buttons + and – simultaneously.
The display shows “8888” during reload.

Conclusion

The Siemens RDF300 Room Thermostat provides a comprehensive range of Service Level parameters that enable engineers and technicians to configure HVAC systems efficiently and accurately.
Understanding parameters such as P01 through P14, along with the built-in Diagnostic & Test functions, simplifies installation, commissioning, troubleshooting, and routine maintenance.
By using the correct parameter settings, you can improve system performance, occupant comfort, and overall energy efficiency.
If this guide helped you, consider sharing it with your colleagues and bookmark it for future HVAC commissioning and service work.
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Frequently Asked Questions

1. Can Service Level parameters be changed while the thermostat is running?

Yes. Most Service Level parameters can be modified during normal operation, and the settings are automatically stored in memory.

2. What is the difference between Service Level and Expert Level?

The Service Level contains commonly used configuration parameters, while the Expert Level includes advanced settings and diagnostic functions intended for experienced technicians.

3. Which thermostat models support these parameters?

The article states that these settings apply to the RDF300, RDF340, RDF400, RDF600, and RDF600T models, although some parameters are not available on every model.

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Video Playlist Link

For a step-by-step guide on accessing the Siemens RDF300 Room Thermostat parameter settings and to learn about other Siemens thermostat models and their technical specifications, watch the YouTube video using the link below.

📺 Siemens Room Thermostat Playlist

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