Hydroid – Series User Manual
27 04/19
TROUBLESHOOTING
Solenoid valve malfunction
Inspect / replace solenoid valve and/or coil
Low PRODUCT
(purified water) Flow
See temperature correction sheet
Fouled or scaled membrane
High PRODUCT
(purified water) Flow
Damaged or oxidized
membrane
Exceeding maximum
feedwater temperature
See temperature correction sheet
Poor PRODUCT
(purified water) Quality
Damaged or oxidized
membrane
If water quality display not lit, check fuse F2 below
transformer
If fuse is ok, check power terminals to L1 and L2 with
A voltmeter. If no power, rewiring may be required.
Defective controller board
If power to terminals is OK, the board may be
defective and should be replaced.
Inlet Valve Will Not
Operate
If shutdown conditions are active and inlet LED, L2 is
lit, check fuse F1.
Defective controller board
If shutdown conditions are active and inlet LED L2 is
NOT lit, board may need to be replaced.
Use voltmeter to check inlet terminals for power to
controller board. If board has power, check valve and
valve wiring.
If shutdown conditions are active and RO LED L1 is
lit, check fuse F1.
Defective controller board
If shutdown conditions are active and inlet LED L1 is
NOT lit, board may need to be replaced.
Use voltmeter to check inlet terminals for power to
controller board. If board has power, pump motor and
motor wiring.
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