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Code Number Possible Cause Corrective Action
187 Front board power supply either too low or too high.
(Generates 173 - Low input voltage code if Level 2
code 188 is present)
(Generates 170 code if 188 is not present)
Contact a pool professional.
188 VAC input voltage is too low.
(Generates 173 code if Level II code 187 is present)
Contact a pool professional.
189 Relay not conducting in the forward direction.
(Generates 171 code - Backboard service)
Contact a pool professional.
190 Relay not conducting in the reverse direction.
(Generates 171code - Backboard service)
Contact a pool professional.
191 High cell current (at upper limit of A/D converter) and
cell voltage below 19V.
(Generates 170 code front board service)
Contact a pool professional.
192 High cell current and cell voltage below 19V.
(generates 171 code – Backboard service)
Contact a pool professional.
193 MeasuredsignicantcellcurrentwhenSCRswere
turned off.
(Generates 170 code – front board service)
Contact a pool professional.
194 Cell Current is 85% lower than desired and cell
voltage above 19V
(Generates 125 code - Cell dirty or needs replacement)
Contact a pool professional.
194 Salinity invalid due to out of range measurements
caused by front board error
(Generates 170 code – front board service)
Contact a pool professional.
7.4 Additional Letter Codes
Code Condition Reason
EC External Control ORP unit or external controller has shut off chlorine
production.
Lo Low Temperature Cutoff Temperature of Pool is < 50ºF (10°C). Chlorine
production stopped.
bo Boost In “Boost” mode unit will operate at 100%
production for 24 run time hours.
HH High-High Input has exceeded Maximum Range.
JA AquaLink® RS Online AquaLink RS is controlling the AquaPure and
desired output percentages.
Jb Boost (AquaLink RS Interface) AquaLink RS is controlling the AquaPure and
“Boost” is active.
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