4. Troubleshooting
Troubleshooting by alarm code
SMGB0097 rev.0 - 07/2015
105
4
Alarm code
13-13
C1-13
Freeze protection · Freeze prevention
Alarm stop reason
Cold water temperature falls below 1ºC.
PCBc (CPU PCB) PCN12 short line is disconnected
N O T E
• In case of detection by inlet water temperature thermistor or in case of detection by disconnection of PCN12 short line
“
13-13
”
• In case of detection by outlet rear thermistor (for protection) or outlet water temperature thermistor (for control) “
C1-13
”
PCB monitoring position
PCBc (CPU PCB) CN4 (Inlet water temperature thermistor (Twi)), CN5 (Outlet water temperature thermistor (for water
temperature control Two1))
PCBd (I/O PCB) CN25 (Outlet rear thermistor Two2(for protection))
PCBc (CPU PCB) PCN12 (Short line)
Clogging of water strainer
Adjustment of cold water thermo setting
value. Shall be within usage range
Clogging of heat exchanger
Adjustment of reverse rotation of pump
Adjustment of water amount (inlet-outlet
water temperature)
Replace thermistor
Correction of
connections
Check PCBc (CPU PCB)
and PCBd (I/O PCB)
Yes
Yes
Yes
No
No
Cold water
temperature has
actually dropped under 1ºC,
due to low inlet water temperature,
lowered low pressure, etc.
(Confirmed from data
immediately before)
The connection and
insertion of connector
PCBc (CPU PCB) and PCBd
(I/O PCB) are correct
Remove the
connectors and
measure thermistor resistance.
Is resistance value
normal?
N O T E
• There is 1 inlet temperature thermistor attached to each chiller unit.
• There are 2 thermistors for detection of outlet water temperature attached to each chiller unit.
• The relation between detected thermistor and alarm indication, as well as their connected PCB codes are shown in the
table below.
Abnormality code
Detected thermistor
PCB code
Connector code
C1-13
Outlet rear thermistor
Two2 (rear side (for protection))
PCBd
CN25
Outlet water temperature thermistor
Two1 (piping side (for control))
PCBc
CN5
13-13
Inlet water temperature thermistor Twi
PCBc
CN4