Carel gaSteam UG045 05 Serie Manual De Servicio página 41

Code Alarm
ALP25 Secondary no
water
ALM21 Secondary
foam alarm
ALB03 Secondary unit
low production
ALC05 Secondary unit
level sensor
ALC06 Autotest failed
alarm on sec-
ondary
ALW12 Secondary
boiler alarm
ALC07 Secondary unit
high conduc-
tivity
ALA18 Secondary unit
preheating
probe
ALA19 Secondary unit
conductivity
probe
ALR02 Retain memory
on secondary
ALA23 Frost protection
force drain on
secondary
ALW04 Warning: Au-
totest
ALW05 Warning: Level
sensor fault
gaSteam +0300123ML rel. 1.0 - 03.12.2021
Cause
No feedwater
Entrainment of foam in the boiler
during boiling
Input power not available;
With the unit on, there is no steam
production or water preheating;
fl ue gas outlet or air intake blocked;
gas shut-off valve closed, burner and/
or controller malfunction
The level sensor may not be working
correctly
Probable problems with: Feedwater,
level control, fi ll solenoid valve
Note: check the alarm log for any
warnings relating to the events
that generated the alarm (autotest
warning, level sensor warning, low
production warning)
Boiler full of water to the
high level sensor on the
cover, without request
for humidifi cation
High feedwater conductivity
alarm
NTC water temperature probe not
connected or damaged
Conductivity meter not connected or
damaged
Problem in the electronic controller
temperature below 5°C, water drained
using the pump to protect the
humidifi er
Probable problems with: Feedwater,
level control, fi ll solenoid valve
Note: check the alarm log for any
warnings relating to the events
that generated the alarm (autotest
warning, level sensor warning, low
production warning)
The level sensor may not be working
correctly
Possible solution
• Check that the supply pipe to the humidifi er
and the internal tubing are not blocked or
choked and that there is enough pressure
(0.1-0.8 MPa, 1-8 bars)
• Check operation of the fi ll solenoid valve
• Check that there is not excessive back-pres-
sure in the steam outlet, preventing water
from entering the boiler due to gravity
• Check that the steam outlet hose is not
choked or that there are no pockets of
condensate
• Check that the level sensor is working correct-
ly, clean if necessary
The entrainment of foam is generally due to the
presence of surfactants in the water (lubricants,
solvents, detergents, water treatment or sof-
tening agents) or an excessive concentration of
dissolved salts. Purge the feedwater lines Clean
the boiler
• check the gas pressure and that the gas shut-
off valve is open;
• make sure that the air intake is not blocked;
• check the fan power
connection;
• check operation of the brushless fan, the fl ue
gas outlet and air intake;
• burner fl ame malfunction;
• check the connections between the fl ame
control board and the burner, and between
the electrical panel and the fl ame control;
• check the connections between the unit
controller and the intermediate terminal block
in the electrical panel
Switch the unit off and clean the boiler, the
level sensor and the fi ll solenoid valve Check
correct water supply to the boiler;
• Make sure that the unit receives water
• Switch the unit off and clean the level control
and the fi ll valve
• Check the fi ll valve for leaks;
• Check whether the high level sensor is dirty;
• Check that there is no condensate return
along the steam hose;
• Switch the unit off and clean the electrodes
that measure the water conductivity
• If the problem persists, change the origin of
the feedwater or feature a suitable treatment
system (demineralisation, even partial)
• The problem cannot be solved by softening
the feedwater
Check preheating operation and the settings of
the parameters on screen Eb02;
Check the connection of the conductivity meter
for measuring feedwater conductivity
Replace the controller
Check the temperature inside and outside
of the humidifi er. Increase the temperature
inside the humidifi er by fi tting heaters where
necessary
• Make sure that the unit receives water
• Switch the unit off and clean the level control
and the fi ll valve
Switch the unit off and clean the boiler, the
level sensor and the fi ll solenoid valve Check
correct water supply to the boiler;
ENG
Reset Action
Stop with Stop pro-
manual reset duction
Stop with Stop pro-
manual reset duction
Stop with Stop pro-
manual reset duction
Stop with Stop pro-
manual reset duction
Stop with Stop pro-
manual reset duction
Stop with Stop pro-
manual reset duction
Stop with Stop pro-
manual reset duction
Signal
only
Signal
only
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