Viessmann Vitomax HS Series - User Manual

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Operating and service instructions

for contractors

Viesmann

Vitomax HS

Type M73

Type M75

Type M93

Type M95

High pressure steam boiler

VITOMAX HS

5837984 GB 1/2019

Please keep safe.

Other manuals for Viessmann Vitomax HS Series

Installation Instructions24 pages

Questions and Answers

J
Jason JohnsonAug 15, 2025
What to do if the burner does not start in my Viessmann Vitomax HS?
- B
  Bruce BellAug 15, 2025
  If the Viessmann Boiler's burner doesn't start, first check if the mains isolator is switched ON to ensure voltage is present. If the burner fault indicator is illuminated, press the reset button on the burner control unit. Also, verify the fuel supply line for any obstructions and check the shut-off valves. Finally, examine the safety equipment, in case the safety chain has been activated.
B
Brittany BarberAug 18, 2025
Why is my Viessmann Vitomax HS Boiler discharging from the safety valve?
- J
  jacobhillAug 18, 2025
  If the Viessmann Boiler's safety valve is discharging, verify that the discharge pressure matches the maximum permissible operating pressure; replace the safety valve if required. Inspect the pressure regulator and pressure limiter adjustments, correcting them if the operating pressure is too high. Clean the valve seat if it's contaminated, and clear any blockages in the water trap pipe.
K
Kathleen AlexanderAug 21, 2025
What to do if the water level limiter switches off in my Viessmann Vitomax HS Boiler?
- D
  Daniel HuntAug 22, 2025
  If the water level limiter switches off on your Viessmann Boiler, open the shut-off valve in the feedwater line. Also, check the mains water connection to ensure there is feedwater in the feedwater tank. You should also determine the cause of the damage to the water pump and water level controller in accordance with the installation instructions.
S
Stephanie OlsenAug 25, 2025
How to lower the flue gas temperature in my Viessmann Vitomax HS?
- B
  Brittany PerezAug 26, 2025
  If the flue gas temperature is too high in your Viessmann Boiler, clean the boiler to address any contamination on the flue gas and water sides that may be reducing heat transfer. Also, check the burner heating output to ensure that the rated boiler heating output is not exceeded.
T
tiffanynorrisAug 28, 2025
Why does the water level limiter keep switching off on my Viessmann Boiler?
- T
  Tamara GarciaAug 28, 2025
  If the water level limiter switches off and you notice severe water level fluctuations in your Viessmann Boiler, drain water from the boiler and feedwater tank, then refill with treated water. Blow down more frequently, and check the water treatment system. Also, check and adapt the electrode length.
C
Charles CoxAug 31, 2025
How to fix high water level in my Viessmann Vitomax HS Boiler?
- S
  samantha09Sep 1, 2025
  If the water level is too high in your Viessmann Boiler, install a steam trap to ensure the steam distributor above the boiler is adequately drained. Additionally, check the electrode length, in case the water level is set too high.
S
Shane MitchellSep 4, 2025
How to prevent oxygen corrosion in my Viessmann Vitomax HS Boiler?
- P
  Peggy MartinSep 4, 2025
  To prevent oxygen corrosion on the water side of your Viessmann Boiler, check the water treatment system and injection system in accordance with VdTÜV guideline if you are topping up with unsuitable water. If the boiler is often taken out of service without being preserved, switch to standby (95 °C) instead of a complete shut down.
C
Casey WoodSep 7, 2025
Why is there steam knocking in my Viessmann Vitomax HS's condensate container?
- C
  Cynthia SimsSep 7, 2025
  If you hear steam knocking inside the condensate container or feedwater tank of your Viessmann Boiler, install or clean the check valve (observe the flow direction) because the check valve in the feedwater line might be missing or faulty. Identify and repair any faulty steam trap in the system. Reduce steam pressure, as U-bends might buckle.
L
Louis ReynoldsSep 12, 2025
What causes steam hammer inside a Viessmann Vitomax HS Boiler?
- R
  Robert JonesSep 12, 2025
  If there's steam hammer inside your Viessmann Boiler, connect the feedwater line to the correct connector, ensuring that feedwater is fed in at the feedwater connector.

Viessmann Vitomax HS Series Specifications

General

Brand	Viessmann
Model	Vitomax HS Series
Category	Boiler
Language	English

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