Phoenix 4800 E, Owner'S Manual

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8 Trouble Shooting
9 Troubleshooting
Trouble Probable Fault Probable Cause Corrective Action
1. Main power off Check main power and cable
2. Main disconnect open Close or replace disconnect
3. Selector switch open Close or replace switch
Unit Stopped
(fan off, no
heater)
Power/Control
Failure
4. Dehumidistat Repair or replace
1. Motor circuit breaker or
overload tripped
Reset circuit breaker or
overload
2. Contactor failure Repair or replace
3. Motor winding failure Repair or replace
Fan off
(Rotor turns)
Power/Mechanical
Failure
4. Fan motor failure Repair or replace
1. Excessive unconditioned make-
up air
Reduce make-up air
2. Leaking ducts or air handling
equipment outside controlled
area
Seal leaks
3. Access opening to area not
sealed
Close and seal
Excessive
infiltration of
humid air into the
controlled area
4. Area not vapor tight Seal with paint or vapor barrier
1. Dehumidistat needs
adjustment
Re-adjust
2. Improper settings Re-adjust
Faulty humidity
controls
3. Defective Replace
1. Dirty filter Clean or replace
2. Obstruction at inlet, outlet or
ducting
Remove obstruction
Inadequate air flow
3. Clogged desiccant media
(high pressure differential
across media)
Remove and replace media
rotor
1. Element failure Check elements – repair or
replace
2. Low / no voltage Correct power supply /
breakers
Inadequate or no
reactivation heat
3. Control elements failure Control set point / repair or
replace
1. Air leaking into dehumidifier Replace access door gaskets Air seals and
gaskets
2. Air bypassing media or leaking
seals
Check media position, replace
seals
1. Chain Repair or replace
2. Motor/gear box Repair or replace
3. Damaged desiccant rotor Repair or replace
Unit running
but humidity
rises
Ineffective
desiccant media
4. Contaminated or damaged
desiccant
Replace desiccant rotor