DuraChill™ Air and Water Cooled 5, 7.5 and 10 HP Chillers

Display, Alarm and Error Messages
When an alarm or error condition is detected, “Ft” appears in the left display and a corresponding code flashes on the right display. Operational limit
parameter alarms will shut down compressor, fan, pump and heaters. Alphabetical codes will also appear on the right display. An audio alarm will also sound.
After taking corrective action, restart unit to clear fault or error.

Code = 02
Description = Low limit temperature alarm
Action required = Alarm – Process fluid temperature has dropped below low limit temperature setting. Increase heat load or decrease “LL” low temperature alarm setting.
Default = 39ºF (4ºC)

Code = 03
Description = High limit temperature alarm
Action required = Alarm – Process fluid temperature has reached high temperature limit setting.
Decrease heat load or increase “HL” high temperature alarm setting.
Default = 95ºF (35ºC)

Code = 04
Description = Over-Temperature Alarm (Select Models Only)
Action required = Alarm – Process fluid temperature is above factory set high temperature cutout.
On air-cooled condenser units the cutout will reset automatically after the temperature of the fluid is lowered. On water-cooled condenser
units the cutout must be manually reset after the temperature of the fluid is lowered. A red button is accessible through the rear panel.
Default = Units without heater option “OTP” jumpered on PCB

Code = 05
Description = Low liquid level alarm (Select Models Only)
Action required = Delayed Alarm – Activated when the liquid level in the reservoir falls below an acceptable level for 30 seconds. On units with the liquid level float switch option. Wired in series with mechanical flow switch – see “07 Low Flow Alarm”
Default = See Fuse Bit Setting 5.4

Code = 07
Description = Low Flow Alarm
Action required = Alarm – Flow rate has dropped below minimum flow rate setting.
Correct cause of low flow rate or decrease “FL” minimum flow rate setting (See “FL” Section 5.4)
Secondary – Mechanical Flow Switch closes with flow (~4 GPM Minimum). If installed in combination with optional water level float
switch they are wired in series and both must be closed, if either opens due to low water level or low flow this alarm or “EFL” Flow Error (See “EFL” below) may be activated.
Default = ~4 GPM Minimum Required for Flow Switch

Code = 08
Description = High Pressure Alarm
Action required = Delayed Alarm – Activated when fluid outlet pressure has exceeded high pressure limit setting for 30 seconds.
Decrease outlet pressure or raise “FP” fluid pressure limit setting.
Default = 100 PSI 689 kPa

Code = 09
Description = Internal software fault
Action required = Fault – Default unit to ºC or ºF, if fault persists replace Control PCB
NOTE: Some parameters will reset to default values – this could activate another fault code if is cleared. Review and return all parameters to usersettings.
Default = N/A

Code = 10
Description = Triac fault
Action required = Fault – Default unit to ºC or ºF, if fault persists replace Control PCB
NOTE: Some parameters will reset to default values – this could activate another fault code if is cleared. Review and return all parameters to user settings.
Default = N/A

Code = 11
Description = Internal RTD probe fault
Action required = Fault – RTD Sensor, check for open or shorted sensor (Reference resistance values 100[ (ohms) @ 0ºC / 138.51[ @ 100ºC If probe tests good, replace control PCB.
Default = N/A
Code = 12
Description = External RTD probe fault
Action required = Fault – RTD Sensor, check for open or shorted sensor (Reference resistance values 100[ (ohms) @ 0ºC / 138.51[ @ 100ºC If probe tests good, replace control PCB.
Default = N/A

Code = 13
Description = Communications fault
Action required = Fault – Default unit to ºC or ºF, if fault persists replace Control PCB
NOTE: Some parameters will reset to default values – this could activate another fault code if is cleared. Review and return all parameters to user settings.
Default = N/A

Code = 14
Description = ADC fault, internal probe
Action required = Fault – Default unit to ºC or ºF, if fault persists replace Control PCB
NOTE: Some parameters will reset to default values – this could activate another fault code if is cleared. Review and return all parameters to user settings.
Default = N/A

Code = 15
Description = ADC fault, external probe
Action required = Fault – Default unit to ºC or ºF, if fault persists replace Control PCB
NOTE: Some parameters will reset to default values – this could activate another fault code if is cleared. Review and return all parameters to user settings.
Default = N/A

Code = 16
Description = Front Panel – High Ambient Temperature Alarm
Action required = Alarm – Maximum ambient temperature limit. Displayed and settable only in ºC.
NOTE: Air-Cooled Chiller’s rated cooling capacity is dependent on an ambient temperature below 104ºF (40ºC) and performance will
decrease as the ambient temperature rises. Continuous operation at ambient temperatures above 104ºF (40ºC) is not recommend for any air or water cooled chiller.
Default = 45ºC

Code = 17
Description = Rear Panel – High Ambient Temperature Alarm (Select Models Only)
Action required = Alarm – Maximum ambient temperature limit. Displayed and settable only in ºC.
NOTE: Air-Cooled Chiller’s rated cooling capacity is dependent on an ambient temperature below 104ºF (40ºC) and performance will
decrease as the ambient temperature rises. Continuous operation at ambient temperatures above 104ºF (40ºC) is not recommend for any air or water cooled chiller.
Default = 45ºC

Code = 18
Description = Ambient Temperature Probe (P3) Fault (Select Models Only)
Action required = Fault – RTD Sensor, check for open or shorted sensor (Reference resistance values 100[ (ohms) @ 0ºC / 138.51[ @ 100ºC If probe tests good, replace control PCB.
Default = N/A

Code = 19
Description = Pump Overload (DAP1) Fault
Action required = Pump – Check continuity across “DAP1” on PCB through NO contacts on overload relay, reset overload relay, and check pump fuses.
Default = N/A

Code = 20
Description = Compressor Overload (DAF2)
Action required = Compressor Pressure Sensors – See Troubleshooting 7.5.
Default = N/A

Code = 21
Description = Fan Overload (DAF1) Fault
Action required = Fan(s) – Check continuity across “DAF1” on PCB through NO contacts on overload relay(s), reset overload relay, check fan(s) fuses. NOTE: On 10 HP Chillers both overload relays NO contacts wired in series with “DAF1”.
Default = N/A

Code = 22
Description = Pump 2 Overload (DAP2) Fault (Select Models Only)
Action required = Pump 2 Option only – Check continuity through NO contacts on overload relay, reset overload relay, check “Pump 2 Fuses”.
Default = “DAP2” jumpered on PCB

The alarms below will be displayed in the right hand display.
Code = EFL
Description = Low fluid level or Low fluid flow
Action required = Warning / Alarm – Audible alarm will sound 5 times, once every 8 seconds. If alarm condition continues the unit will shut down.
- Fluid level too low for units with fluid level float switch.
- Fluid flow too low for units with flow switch (“P0” no pump - no reservoir option).
Default =

Code = EHA
Description = High Ambient Temperature Alarm
Action required = Alarm – The ambient temperature (measured on Control PCB) is higher the high ambient temperature setting.
Lower the ambient temperature or increase the “HA” temperature limit setting.
Default = 45ºC

Code = EHL
Description = High limit temperature alarm
Action required = Alarm – Process fluid temperature has reached high temperature limit setting.
Decrease heat load or increase “HL” high temperature alarm setting.
Default = 95ºF 35ºC

Code = ELL
Description = Low limit temperature alarm
Action required = Alarm – Process fluid temperature has dropped below low limit temperature setting.
Increase heat load or decrease “LL” low temperature alarm setting.
Default = 39ºF 4ºC

Code = LO H2O
Description = No fluid flow and pressure
Action required = Warning – Indicates the chiller did not detect any fluid flow or pressure upon startup. Unit will normally run after 5 minutes – leave chiller with error code displayed for 5 minutes.
Default =

The codes below will be displayed in the right display and indicate display control status.
Code = LLO
Description = Local Lockout
Action required = Normal – Indicates the Local Lockout feature has been enabled.
Prevents settings from accidentally being changed. To enable the local lockout feature “LLO”, press and hold the “Select / Set” knob until “LLO” is displayed (approximately 5 seconds).
Default =

Code = CAN
Description = Cancel Local Lockout
Action required = Normal – Appears when Local Lockout feature has been canceled. To cancel the local lockout feature, press and hold the “Select / Set” knob until “CAn” is displayed (approximately 5 seconds).
Default =

Code = EC
Description = External remote control active
Action required = Normal – Chiller in standby until remotely activated. (Option)
Default =

Automatic Restart from Alarm Mode
This Chiller is equipped with an automatic restart feature to avoid false alarms. If any alarm condition is detected the chiller will turn off, wait 30 seconds and then turn on.
This is to avoid nuisance trips due to temporary flow obstructions, temperature swings or electrical line noise.
Three restart attempts will be made. If the alarm condition continues to exist then an alarm will sound and the chiller will remain off until the problem is corrected.

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