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Siemens Building Technologies Basic Documentation RVA63.242, RVA53.242 CE1P2373E
Landis & Staefa Division Handling 26.03.2001
2.8 Operational faults
No display on the controller:
• Is the heating plant's main switch turned on?
• Are the fuses in order?
• Check the wiring
Heating control does not function. There is no display of the time of day, or the
time displayed is incorrect
• Check fuses of the plant
• Make a reset: Isolate controller from the mains supply for about 5 seconds (e.g. turn
off the boiler's main switch for 5 seconds)
• Set the correct time of day on the controller (operating line 1)
• Check the time of day on the clock time master if the controller is used in a system
Controlling element does not open / close or does not operate correctly.
• Manual lever of controlling element may not be engaged
• Wiring to the controlling element interrupted (output test)
• Check wiring of the sensors (input test)
• Quick setback or the automatic 24-hour heating limit is active
• Check the settings
Heating circuit pump does not run
• Is the right type of plant displayed (setting line 53)?
• Check wiring and fuse (output test)
• Check wiring of the sensors (input test)
• Check the settings
Burner does not switch on
• Press burner's reset button
• Check the fuses
• Wiring to the controlling element interrupted (output test)
• Check the electromechanical control thermostat (TR) and the manual reset safety
limit thermostat (STB)
• Quick setback or automatic 24-hour heating limit is active
• Check wiring of the boiler temperature sensor (input test)
Pump does not run
• Check wiring and fuse (output test)
• Check wiring of the sensors (input test)
D.h.w. is not being heated
• Has the button for d.h.w. heating been activated?
• Check setting of the electromechanical control thermostat (TR) installed on the
boiler. It must be above the TKmax setting
• Check setpoint of the d.h.w. temperature
• Check actual value of the d.h.w. temperature
• Check if d.h.w. heating is released
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