19
ERROR CODES
Error
Code
Error Description
Notes
1
DCP power error
Remote monitoring package has lost power.
2
DCP communication line short
Power available to the remote monitoring package but communication line is shorted.
3
DCP communication line noise
Remote monitoring package cannot communicate with the chiller-heater.
4
Accessory error
Optional fire safety shutdown has been enacted.
5
Chilled/hot water pump interlock
error
Voltage signal from terminal CM2 in the junction box is not returning to terminal 3 in the
junction box.
6
Cooling water pump interlock
error
Voltage signal from terminal CM2 in the junction box is not returning to terminal 4 in the
junction box.
7
Cooling tower fan interlock error
Voltage signal from terminal CM2 in the junction box is not returning to terminal 5 in the
junction box.
8
Solution pump error
Solution pump VFD is reporting alarm status.
9
Generator (HGE) over heat error
GP sensor indicates 325°F (163°C) or greater. Reset allowed when GP sensor reads below
302°F (150°C).
10
Generator (HGE) temp error
GPSC or GPSH manual limit switch open when it should be closed.
12
Generator (HGE) solution level
error
Generator level switch has opened when it should be closed. Ignored for first 10 minutes
of burner operation.
13
WTO sensor error
WTO sensor reads below 14°F (-10°C) or above 212°F (100°C).
16
Flow switch error (FS1)
FS1 did not open after "P" dry contacts opened. FS1 assumed stuck closed.
18
Seismic switch error
Seismic switch is open when it should be closed.
19
Generator (HGE) over heat alarm
The Generator temperature or HPS pressure reading has been unusually elevated for 30
consecutive minutes, but has not reached 325°F (163°C).
20
Cooling water scale alarm
The temperature rise through the cooling water circuit is less than expected.
21
Cooling water scale error
The temperature rise through the cooling water circuit is less than expected to the point
of potentially damaging the chiller-heater.
24
Freeze protection error
Freeze protection logic steps have been ineffective.
25
High cooling water temperature
Cooling water above acceptable temperatures: CTI above 95°F (35°C) and/or CTO above
108°F (42°C) for 3 consecutive minutes.
26
Generator (HGE) over heat in
heating mode
GP sensor reads above 252°F (122°C) in heating mode.
27
Chilled water flow switch error
Flow Switch FS1 is open when it should be closed.
28
Cooling water flow switch error
Optional cooling water Flow Switch (FS2) is open when it should be closed.
29
CTO sensor error
CTO sensor reads below 14°F (-10°C) or above 212°F (100°C). Ignored for first 10 minutes
of P2 operation.
30
Exhaust gas temperature error
EXH sensor reads above 446°F (230°C)
31
Generator (HGE) pressure error
HPS indicates a pressure above 750 mmHg for 10 consecutive seconds. Reset allowed
when pressure falls below 550 mmHg.
32
GP sensor error
GP sensor reads above 446°F (230°C)
33
CTI sensor error
CTI sensor reads below 14°F (-10°C) or above 212°F (100°C). Ignored for first 10 minutes
of P2 operation.
35
Aspirator and exhaust fan error
The small exhaust fan in the control box has failed or is unable to cool the box properly.
36
CND sensor error
CND sensor reads below 14°F (-10°C) or above 212°F (100°C).
40
Loss of cooling capacity
LT temperature reading has not fallen below 59°F (15°C) within 30 minutes.
43
Low cooling water temperature
CTI sensor reads below 46.4°F (8°C) at start of operation, or has dropped below this limit
for 2 consecutive minutes during operation.
44
Changeover valve error
Changeover valve end switch has not closed within 22 seconds.
52
Combustion system error
Burner control indicates alarm status. This incorporates all burner limits including air
pressure switch, gas pressure switches, and flame safeties.
72
LT sensor error
LT sensor reads below 14°F (-10°C) or above 212°F (100°C).
77
Generator (HGE) pressure sensor
error
HPS output below 0.5vdc for 30 consecutive seconds, OR correlation of HPS pressure
reading disagrees with GP senor reading after 10 minutes while GP sensor reads above
212°F (100°C).
88
Corpus pressure error
HPS pressure reads above typical atmospheric pressure. Chiller-heater requires tubing
inspection to check for tubing breech.
93
Model setting error
Configuration and options do not match the model selected in ACT5 Unit Data Set.
94
Check mode neglect
Unit left in test mode without interaction longer than 30 minutes.
95
Data initial clear
CPU board requires reboot or replacement.
96
Extended Error Code Alert
An error code number beyond 99 exists.
101
WTI sensor error
WTI sensor reads below 14°F (-10°C) or above 212°F (100°C).
105
Low chilled/hot water temp alert
WTO sensor reads below 35.6°F (2°C).
Table 2
– Error Codes
