Check 2 — Display Values
Verify CO2 regulator, Brite pressure, and temperature readings on the FizzWizz display in Test Mode — Health Check Idents A, B, and C.
Check 2 — CO₂_In display values
Confirm the three display readings are plausible before testing solenoids. This check verifies sensors, not solenoids. If a sensor is misreading, every later check that depends on it becomes unreliable, so resolve failures here first.
Preconditions
- Setup and Check 1 complete
- CO₂ connected to CO₂_In, regulator set to 30–40 psi
- Stone hose and arm hose still disconnected
- FizzWizz in Test Mode
The checks
| Ident | Display value | Criterion | Tolerance |
|---|---|---|---|
| A | CO₂ reg psi | Equals the supply regulator dial, and falls between 30 and 40 psi | ±3 psi |
| B | Brite psi | Reads 0.000 — the arm circuit is open to atmosphere | −0.18 to +0.18 psi |
| C | Temperature | A representative value for the probe's surroundings | Judgement |
Reading A: regulator pressure
Compare the CO₂ reg psi figure on the display against the dial on your supply regulator. They should agree within 3 psi, and the value should sit in the 30–40 psi band. Record both numbers on the Results Form — the gap between them tells you whether a transducer is drifting.
Reading B: Brite pressure
With the arm hose disconnected, the arm circuit is vented to atmosphere, so Brite psi should read essentially zero. Anything outside ±0.18 psi indicates a transducer problem, and often fluid in the pipe feeding the transducers.
Reading C: temperature
Representative means the reading should be plausible for wherever the probe currently is — roughly ambient if it is sitting in the open, or roughly tank temperature if it is still installed. This is a sanity check, not a calibration. If you need to confirm the probe is genuinely accurate, run the Slushy WizzTemp Test, which verifies it against a known 0°C reference.
If a check fails
| Ident | Symptom | Actions |
|---|---|---|
| A | Wrong reg psi | 1. Try a different CO₂ regulator to rule out the regulator itself. 2. If still wrong, change the CO₂_In pressure transducer. 3. Check the CO₂_In check valve. |
| B | Brite psi reads wrong pressure | 1. Change the Brite pressure transducer. 2. Inspect for fluid in the pipe leading to the transducers. |
| C | Temperature reads wrong | 1. Change the WizzTemp sensor. 2. Inspect the temperature sensor internal loom. Confirm with the Slushy WizzTemp Test. |
Next step
Check 3 — Solenoid CO₂_In
Test each solenoid for stuck-open and stuck-closed failures.