Honeywell DTC 100/2 - TROUBLESHOOTING

DTC 100/2
12
Most frequently occuring failures
PROBLEM POSSIBLE FAILURE ELIMINATION
No matter what the
temperature is, the
pump never operates
- there is no mains voltage
- the switch is in 0-position
- short-circuited DHWS sensor
- short-circuited collector
sensor
- check the mains voltage
- put the switch into AUTO
position
- check the sensors
No matter what the
temperature is, the
pump keeps operating
- the switch in position 1
- disconnected collector sensor
- short-circuited DHWS sensor
- put the switch into
position AUTO
- check the sensors
Temperature limits do
not work
- the motor actuated ball valve
remains open, the closing flap
stays open (termal circulation
of water is possible)
- check the machine
installation
Despite the warmness
of the collectors, the
sanitary water is cool
or not warm enough
- the setting of T2 is too low
- the difference is set too high
- check the settings