Troubleshooting; Care And Maintenance - Viessmann VITOTRON 100 Installation And Service Instructions Manual

Instructions for the User

Troubleshooting

Do not attempt to service this space heating water heater
unless you have been trained in all aspects of its functionality
and methods to repair.
Symptom
All indicators on control
panel are OFF
"PSI" indicator blinks
"GPM" indicator blinks
Circulator indicator blinks
"Heating status" is off
"Heating status" blinks
and "Inlet temp." blinks
and "Outlet temp." blinks
Space heating water
heater does not heat
EEE message on display
Insufficient heat output

Care and Maintenance

1. In order to protect flow sensor located within the
space heating water heater, it is imperative that the
pre-installed magnetic filter is removed and cleaned
at least annually. Failure to clean out this filter could
increase contamination of the space heating water
heater by system residue.
18
Vitotron 100 Electric Space Heating Hot Water Heater Installation/Service
Reason
No power to space heating water
heater
Insufficient pressure below 7 psi
Pressure sensor failure
Pump is blocked
Heat does not circulate through
the space heating water heater
– space heating water heater is
blocked
Failure of pump or flow sensor
a failure of pump or flow sensor
Lack of water flow - 2.1 GPM min
No thermostat connection
Failure of control board
Off Peak signal = no heat
A failure of inlet temperature
sensor, space heating water
heater in failure condition
A failure of outlet temperature
sensor or loose connection
Failure of cylinder temperature
sensor
A failure of control panel
Data record error
Heating elements
Control panel set up failure
Failure to service properly may lead to further damage to
components.
Check for 240 VAC on space heating water heater
main connection terminals
Reset manual safety high limit
Contact authorized service person
Switch the controller to pressure view and increase
system pressure above the minimum required 7 psi level.
Switch the controller to pressure view, if display
shows - - Contact authorized service person
Unblock the pump-unscrew the screw on pump
housing and move the pump rotor manually
Air bubble is caught in system, purge the installation,
pump and space heating water heater
Check 1 amp fuse on control panel
Check power supply for circulating pump
Contact an authorized service or the seller
Adjust flow characteristics as needed
Insure thermostat is calling for heat and is above
ambient temperature set point
Verify connections on thermostat
Check fuse on control panel glass fuse 6.3 x 32 mm 2A
Electric utility off peak control
Check connection or replace thermistor sensor
Check connections
Replace HC-DN 15 sensor
Contact authorized service person for replacement of
cylinder temperature sensor or thermostat
Contact authorized service person
Contact authorized service person
Check for resistance on elements
Insure control panel is set up for correct kW and
number of heating elements through advanced settings
2. Periodically check system pressure.
Contact authorized service person to make
adjustments only.
Action