72 EN/01.2019/G22 © STULZ GmbH – all rights reserved
EC TOWER TECHNICAL MANUAL
10.2 Troubleshooting the heater
10.3 Troubleshooting the steam humidifier
Steam humidifier troubleshooting is described in the Steam humidifier OEM User Manual (see Steam humidi-
fier OEM User Manual, section “7.2 Cause of problem, remedy, alarm list“ on page 178).
10.4 Troubleshooting the optional water warning system
This section applies only to EC Towers that are equipped with a water warning system with sensor and sole-
noid valve.
Alarm message Cause for alarm Cause Remedy
C7000:
Electric heater 1
Thermal cutoff switch of heater
has been triggered.
1. Switch temperature >+63 °C.
2. Airflow too low.
Check thermal contact.
Alarm message Cause for alarm Cause Elimination
Solenoid valve does
not open.
Excessive differential pressure. Excessive differential pressure. Install a pressure relief valve in the feed
water supply (see „13.12 Installing the
water warning system“ on page 108).
Faulty coil. Faulty coil. Replace coil („9.7 Replacing the sole-
noid valve coil of the optional water
warningsystem“ on page 70).
Dirt particles are clogging the
solenoid valve armature.
Dirt particles are clogging the
solenoid valve armature.
Solenoid valve does
not close.
Faulty coil. Faulty coil. Replace coil („9.7 Replacing the sole-
noid valve coil of the optional water
warningsystem“ on page 70).
Dirt particles are blocking the
vent hole in the membrane.
Dirt particles are blocking the
vent hole in the membrane.
Clean solenoid valve membrane with
water.
Solenoid valve is
leaking.
Dirt between valve aperture and
membrane.
Dirt between valve aperture
and membrane.
Clean valve body and membrane.
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