IPS Controllers M920 Owner's Manual page 37

M920 & M920W pH/Dual ORP Controller Owner's Manual
3. Controller undershooting set level: 1) Check for proper valve
positions and leaks in chlorine lines, or 2) Increase dosing time if
using timed feed, or switch to continuous feed if using a salt chlorine
generator.
4. Chemical dose time too low: Increase the dose time.
5. Chemical feeder is empty: Refill the feeder.
6. Chemical check valve/injector is clogged: Switch acid feed tube to
chlorine injector to clean, or replace them.
7. Chemical feed pump or squeeze tube malfunction: Repair the feed
pump or replace the squeeze tube. A squeeze tube will last 3-6
months for commercial properties and 6-12 months for residential
properties.
8. Sensor malfunction: Replace sensor.
D. Chlorine/Bromine level too high or Alert LED On
1. pH should be at your desired set level before addressing any
potential ORP problems.
2. ORP Set level is too high: Check Sanitizer level with test kit and adjust
as necessary.
3. Controller overshooting set level: Lower dosing time, or switch from
continuous feed to timed feed.
4. Problem with chlorine supply: 1) Verify that the chlorine feeder is
not empty, or 2) Verify that the solenoid valve on the feeder is not
stuck open.
5. Sensor tip is dirty: Clean according to maintenance
instructions.
E. Display and LEDs off
1. No power supply: Check circuit breaker and/or controller fuse
protecting the transformer.
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