Carrier

Expand whichever matches what you’re seeing to figure out which component is having the problem and how to test it.

Which Component Is Having the Problem?

Start Here: Check Diagnostics Mode First

Whatever the specific symptom, the first thing to do is a baseline check in Diagnostics Mode (Manual Mode tab > select your machine > Diagnostics Mode tab) — it rules out wiring and configuration issues before you assume the component itself has failed.

• Flowmeter: Swap in a known-working meter, or simulate pulses by hand at the connector, and watch for a reading in Diagnostics Mode. See Not Reading Flow below for the full procedure.
• Valve: Activate the specific valve directly from the tablet in Diagnostics Mode and watch it respond — useful for confirming a valve works (or doesn’t) before digging into wiring.

Flowmeter — wrong volume, no reading, or erratic readings

Not Reading Flow

When the system expects to meter flow and can’t, it’s typically a blockage, the pump not running high enough, or simply a closed valve — including a manual valve accidentally left closed, or an automatic valve not responding.

Rule out a physical blockage before troubleshooting automatic valves. Always check that the valve(s) in question can run in Manual Mode when troubleshooting No Flow errors.

First, confirm the problem isn’t actually in the wiring back to the module or the module’s input, before assuming the meter itself has failed:

1. Swap in a known-working meter. Unplug the flowmeter in question and plug a known-working flowmeter into that same connector, then watch for a reading in Diagnostics Mode. If the known-working meter reads correctly there, the wiring and module input are fine and the original meter is the problem.
2. Simulate pulses by hand. Remove the ground and signal wires from the connector and repeatedly tap them together to represent the pulses a spinning meter would send. If Diagnostics Mode counts the taps, the wiring and module input are working and the meter itself is at fault.

Reading, But Inaccurate or Erratic?

Which type of flowmeter do you have?

Mass Flowmeter

See Mass Flowmeters.

Mechanical Meter (Paddle, Turbine, etc.)

See Mechanical Meters.

Mag Meter

Carrier’s mag meter is an ARAG Orion mag meter. See ARAG Mag Meter for physical inspection, configuration checks, coated sensors, conductivity issues, and indicator light meanings.

Valve — Auto won’t turn on, throttling feels off, or it’s not responding at all

The Auto (Automatic Throttling) Toggle Won’t Turn On

Auto stays disabled until you’ve run the Profile Main Pump Wizard — the system needs that wizard’s Maximum Valve Position result before it can calculate a throttling range. Run the wizard, then Auto will be available.

Auto Is On, But the Mix Doesn’t “Feel” Right

This usually means the Partial Valve Position or Minimum Holdback settings need adjusting for your setup, not that anything is broken. See Carrier Flow & Holdback for what each setting does and how to tune them — the short version: lower the Partial Valve Position to increase suction if product induction is slow, or raise it if induction is too fast.

The Valve Isn’t Responding to the Tablet at All

This is a hardware/communication problem, not a settings problem. Which type of valve do you have?

Digital

Digital valves have two different modes of diagnostics, depending on how they’re controlled. Pick the one that matches your setup.

Controlled Through a Switch Box

These valves are wired through a Switch Box that operates air solenoids, which actually control the valve.

1. Toggle the switch. Check functionality by toggling the switch between Off and On.
2. If the valve doesn’t operate, check whether the relay is being activated.
3. If the relay is activated, check the components wired to the Switch Box.

About the switch light: The light on the switch will illuminate in two different situations — don’t assume it means the switch is manually On. It lights up when the switch is pointed to On, and it also lights up when the switch is pointed to Automatic and the module’s output is requesting that corresponding switch to be active.

Directly Operated by a Module

These are ARAG Digital Valves — there’s no Switch Box or relay in between; the module drives the valve directly.

See ARAG Digital Valve for the fault/cause/remedy table (won’t work, leaks, won’t stop at preset point).

CANbus

CANbus valves have their own indicator light directly on the valve that will show error blink codes if something is wrong. These are the ARAG CAN-Bus Valves.

See ARAG CAN-Bus Valve for blink code meanings, the manual override procedure, and how to check the valve physically.

Regardless of which type your carrier valve is, Diagnostics Mode lets you activate that specific valve directly from the tablet and watch it respond — useful for confirming a valve works (or doesn’t) before digging into wiring.