TROUBLESHOOTING
7-6 SERHT50NA A0808
Humidifier Fail alarm
(HT50-H)
PROBLEM POTENTIAL CAUSE SUGGESTED CORRECTIVE ACTION
Loss of A.C. power.
Improper installation of the chamber or
temperature probe.
Defective temperature probe.
Humidifier heater Assembly is
defective.
Restart humidifier when A.C. power is
available.
See Operating manual for installation
instructions.
Replace temp. probe.
With humidifier chamber firmly secured,
disconnect the square four pin connector on
the Main PCB. Using an ohmmeter,
measure the resistance between the pins of
the two blue wires. Resistance should be <
3000 ohms, but > 0. Next, measure the
resistance between the pins of the two
black wires. Resistance should be approx. 4
ohms. If either of these measurements are
incorrect, replace the heater Assembly
High Prox Temp alarm
(HT50-H)
Defective temperature probe.
Defective connection to Main PCB.
Defective Main PCB.
Replace temp. probe.
Using an ohmmeter, verify continuity from
probe connector to Main PCB.
Replace Main PCB.
LED(s) and or
control panel button(s)
do not function.
Ribbon cable not securely fastened.
Defective Panel PCB.
Verify that both ends of the ribbon cable are
securely fastened.
Replace Panel PCB.
Unit auto triggers
Relief vavle set too high or
pressure transducers out of calibration.
Perform a complete HT50 calibration (see
Section 5)
Meter does not calibrate.
Meter is holding static charge.
Defective meter.
Using a cloth with alcohol, gently wipe the
surface area of the front panel that covers
the meter. Recalibrate.
Replace panel PCB.
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