NuAire NU-5710, Operation And Maintenance Manual

Page: 52 / 64

OM0249 Page 52 of 64
Rev 4 June/2020
Displayed Error Code Code Description Checks and Corrections
Temp Over Set Point,
Decon Temp High
-Temperature over set point
Normal mode and Decon Cycle
Check temperature sensor calibration.
Faulty TRIAC, replace control board.
Temp Under Set Point,
Decon Temp Low
-Temperature time out error
during normal running and in
Decon Cycle
- Decon Time Out
- Temp less than decon temp - 10⁰
for 240 minutes
Check temperature sensor calibration
Replace fuse.
Faulty TRIAC, replace control board
Faulty chamber heater contact NuAire Technical Service.
Door/Perimeter heater needs to be increased with a high
temperature set-point in a low ambient temperature
Failed Sensor Differential
-Sensor temperature (differential)
error normal running.
-Occurs when difference between
sensors exceeds 4°C.
Check temperature sensor calibration
Check connection on control board
One or both temp sensors faulty, replace
Decon Sensor Fail
-Sensor temperature (differential)
error Decon Cycle.
-Occurs when difference between
sensors exceeds 10° C.
Check temperature sensor calibration
Check connection on control board
One or both temp sensors faulty, replace
CO
2
Sensor Shroud Heater
Displayed Error Code Code Description Checks and Corrections
Temp Sensor Failure
-Defective shroud temperature
sensor
Confirm it is plugged in at board connector P6.
Replace CO
2
shroud temperature sensor
Sensor Bay Temp Low
Sensor bay is below temp set point
+2 ⁰ - See CO
2
diagnostics screen
Check control board output to relay, replace board if
faulty.
Check that all connections are secure
Check sensor bay heater for function, replace if faulty.
Sensor Bay Temp High
Sensor bay temp is above 65 deg C
Check control board output to relay, replace board if
faulty.
Check that all connections are secure
Check sensor bay heater for function, replace if faulty.
Check for uncontrolled sources of heat influencing the
bay.
CO
2
System
Displayed Error Code Code Description Checks and Corrections
CO
2
Over Set Point - CO
2
over set point
Perform CO
2
sensor calibration
Check injection solenoid for leaking valve
Check sensor and disk filter for condensation
CO
2
Under Set Point
- CO
2
time out error. The measured
CO2 level has not reached with in the
allowed percentage in the allowed
time. CO2 stops injecting and air is
injected for 15 minutes in case the
sensor is not detecting the CO2.
Check CO
2
gas supply - inline gas filters, CO
2
gas tank
pressure, CO
2
sensor function
Run Cal Inj. Calibration (see Section 9.3.3)
Check/replace CO
2
gas supply tanks
Check for leaks in chamber
- inner door gasket, chamber recirculation tubes
Check for leaks in air pump and hosing
Cal Inject Failed
- Cal inject calibration failed.
Not enough increase in the CO
2
reading after gas was injected.
Check gas supply then run calibration again
Call NuAire Technical Services if error persists.
RH System