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Operation and maintenance
NEW EcoHeater
DSEH200301.01.EN
Continuous product development may give rise to specification changes without notice.
7 Troubleshooting
7.1 Troubleshooting in the event of an alarm
Alarm information is read out on the Carel display. Press the alarm symbol to
view alarms.
Inspection
Possible cause
Corrective action
Is the alarm
“94 Drive offline”displayed?
YES
⇒
The frequency inverter does not
have supply voltage 3×400 V
Check the supply voltage to the frequency
inverter.
Check fuses.
Check cabling for communication between
the frequency inverter and Carel control pa-
nel.
NO
⇓
Has the high-pressure switch
tripped?
Is the alarm
"121 Compr 1, High-pressure
switch"
or
"180 Compr 1,
High-pressure switch"
displayed?
YES
⇒
No or too low flow of water
across the condenser
Defective high-pressure switch
Check the flow of water across the
condenser.
Rest the pressure switch manually.
Check/replace.
NO
⇓
Is the alarm
”118 Compr 1,
Low evaporation pressure”
displayed?
YES
⇒
Insufficient refrigerant volume
Look for leakage, seal the leak and top up
with refrigerant. For requirements and guide-
lines for handling refrigerant, see "2.6 Hand-
No or too low air flow across the
heat recovery coil
Check/adjust the flow.
Defective expansion valve
Check/replace.
NO
⇓
Is the LED flashing red on the
frequency inverter?
YES
⇒
Phase failure/voltage failure
Check the 3-phase supply, measure the
incoming voltage.
Reset the frequency inverter by switching
off the voltage for 1 minute or more. Check
that the compressor is running without
dissonance.
Overload/defective stepless com-
pressor
Reset the frequency inverter by switching
off the voltage for 1 minute or more. Check
that the compressor is running without
dissonance.
NO
⇓
Is the alarm
“AL 120 Compr 1
Low pressure diff.” display-
ed?
YES
⇒
No pressure difference between
the high-pressure and low-
pressure side
Contact service.
NO
⇓
Is the alarm
“AL 59 Compr 1
Low Cond Temp” displayed?
YES
⇒
Condensation temperature too
low
Incoming water to EcoHeater must be at
least 20 °C. Check the water temperature.