Check 4 — Solenoid ARM
Repeat solenoid tests with CO₂ moved to the ARM port — expected results swap. Health Check Idents K through Q.
Check 4 — Solenoid function on ARM
Move the CO₂ supply to the ARM port and repeat the solenoid tests. Because CO₂ now enters the arm circuit, the expected results for each button swap compared to Check 3. That reversal is the point of the test. This is also the only check that proves the vent path actually flows.
Preconditions
Step 4: Move the CO₂ connection
Disconnect from CO₂_In
Disconnect the push-to-connect CO₂ line from the CO₂_In port.
Connect to ARM
Reconnect the CO₂ line to the ARM port.
CO₂ jumper moved to the ARM connection.
At rest — nothing should flow
With no buttons pressed, confirm no gas is flowing from any port.
| Ident | Confirm no flow from | Pass |
|---|---|---|
| K | Stone connection | No flow |
| L | Arm connection | No flow CO₂ is connected here — check fitting is seated and not leaking |
| M | Vent valve | No flow |
| N | Flow meter ball | Ball down, no flow |
Button tests — results are swapped vs Check 3
Note that the expected results are effectively swapped compared with Check 3. That reversal is what proves the routing is correct.
| Ident | Press and hold | Expected result |
|---|---|---|
| O | Up | No gas flows from anywhere — you should hear a quiet click |
| P | Down | Gas pulses out of the Stone connection, and the flow meter ball bounces |
| Q | Enter | Gas pulses from the Vent valve |
Ident Q is the important one
Check Q is the only point in the Health Check where gas should actually come out of the vent. It is the only test that will catch a vent solenoid stuck closed.
If a check fails
| Ident | Symptom | Likely cause / actions |
|---|---|---|
| K | Gas continuously flowing through stone connection | CO₂_in solenoid stuck OPEN — change the CO₂_in solenoid. |
| L | Gas continuously flowing around the CO₂_In connection | Replace the CO₂_In check valve. The FizzWizz will still operate, but there is a risk of reverse fluid flow if the CO₂ supply runs out. |
| M | Gas continuously flowing through vent valve | Vent solenoid stuck OPEN — change the Vent solenoid. |
| N | Flow meter ball is up | Same cause as K — change the CO₂_in solenoid, stuck OPEN. |
| O | Up pressed, gas pulse from arm instead of quiet click | 1. Confirm the flow meter is not turned fully off — rotate CCW. 2. Investigate the Head_Transfer solenoid. Note: the original guide cross-references Ident I flow meter, but O is a listening test and Head_Transfer is the more probable cause. Both steps are listed. |
| P | Down pressed, gas does not pulse through stone | 1. Rotate the flow meter knob counterclockwise and retest. 2. If still no pulse, change the CO₂_in solenoid, stuck CLOSED. |
| Q | Enter pressed, gas does not pulse through vent valve | 1. Check the vent valve itself is OPEN. 2. If it is, change the Vent solenoid, stuck CLOSED. |
To clean or service a solenoid that has been exposed to product, see Solenoid Cleaning & Servicing.
Next step
Check 5 — ARM Display Values
Verify Brite pressure responds to real pressure with CO₂ on the ARM port.