Troubleshooting; Fault Analysis - Viessmann VITOWELL comfort Installation And Operation Manual

Troubleshooting

Fault analysis

Fault Possible cause
Water Connections between components
leakage are sealed poorly.
The tank leaks.
No hot water or The appliance is not powered.
low water
The preset temperature is too low.
temperature
The heating tube fails.
The current leakage
protector fails.
The thermostat fails.
Water
overheating
LED off Appliance is not powered.
The internal wiring is incorrect.
The LED fails.
Leakage of There are a few water drips when the
one-way preset temperature is reached.
safety relief
The water pressure at the water inlet is
valve
too high.
The one-way safety relief valve fails.
Fault error E1 Sensor being short circuited or
(D1 type) broken.
Fault error E2 (D1 Protection against heating without
type) water.
Fault error E3 (D1 Ultra-high temperature protection.
type)
Fault error E5 (D1 Low-voltage protection.
type)
Remedy
Tighten seals.
Switch off the electricity mains and contact our
Technical Servicing Center.
Switch on the electricity mains.
Reset the temperature.
Switch off the electricity mains and contact our
Technical Servicing Center.
Switch off the electricity mains and contact our
Technical Servicing Center.
Switch off the electricity mains and contact our
Technical Servicing Center.
Switch off the electricity mains and contact our
Technical Servicing Center.
Switch off the electricity mains and contact our
Technical Servicing Center.
Switch off the electricity mains and contact our
Technical Servicing Center.
Normal relief.
Mount a pressure reducer at the water inlet.
Replace the one-way safety relief valve.
Switch off the electricity mains and contact our
Technical Servicing Center.
Switch off the electricity mains and contact our
Technical Servicing Center.
Turn off the controller in 5 seconds and resume
automatically after the appliance is powered again.
Resume automatically when the voltage turns
normal.
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