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Fleetwatch FMS · RIH & JB20i Junction Box
How Do I Troubleshoot a No-Flow Situation on a JB20i?
If fuel or fluid won’t dispense, two quick tests tell you where the problem is: the RIH, a relay in the JB20i, or the dispenser/valve. You run them with the RIH key switch and the JB20i bypass toggle switches.
How the Bypass Switches Work
Normally the RIH tells a relay in the JB20i to turn on, and the relay turns on the solenoid valve for that fuel or fluid. The JB20i bypass toggle switches skip the relay and turn the valve on directly. Each bypass switch controls the fluid/relay with the same number (switch 1 = relay 1, and so on).
| CB1 | Power to the RIH. |
| CB2 | Power to the fluid reels (oil, DEF, coolant, etc.). Fleetwatch supplies the power for the fluids. For fuel dispensers, the relay usually just switches (“breaks”) the dispenser’s own power, so CB2 usually doesn’t affect fuel. |
| Toggle DOWN (Auto) | Normal operation. The RIH and relay control the valve. |
| Toggle UP (Bypass) | Emergency/test mode. The valve is powered directly, without the RIH or the relay. |
Caution: qualified personnel only. The JB20i has live high-voltage wiring inside. Fueling in bypass mode skips the RIH, so Fleetwatch does not track fuel dispensed that way. Use bypass only for testing or emergencies, and switch back to Auto as soon as you can.
Quick Answer
| RIH in Manual | Toggle in Bypass | Likely problem |
| Valves open | — | RIH. Replace it with a spare and send it to S&A for repair. |
| No flow | Valves open | Relay(s). The relay usually needs to be replaced. |
| No flow | No flow | Dispenser or valve. Call your equipment service company or facilities maintenance. |
Step by Step
| 1 | Put the RIH in Manual. Turn the RIH key switch from AUTO to MANUAL, then try to dispense again. |
| 2 | Do the valves open in Manual? Yes: the problem is the RIH. Replace it with a spare RIH and send the RIH back to S&A for repair. You’re done. No: go to step 3. |
| 3 | Try bypass mode. Turn the RIH key back to AUTO. Then, in the JB20i, flip the bypass toggle switch for the affected fluid UP to Bypass. Use the switch with the same number as the relay. Check whether the valve opens. |
CB1 (RIH power) and CB2 (fluid reel power) should be UP (on) for normal operation. Bypass switches are DOWN for Auto and UP for Bypass.
| 4 | Do the valves open in Bypass? Yes: the valves worked in Bypass but not in Manual, so the relay(s) usually need to be replaced. Contact Fleetwatch Support for a replacement relay. No: the problem is usually at the dispenser or valve, not Fleetwatch. Contact your local equipment service company or facilities maintenance to check the valves or dispensers. |
| 5 | Set everything back to normal. When testing is done or the repair is made:
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Tip: If only one fuel or fluid won’t flow, test just that switch and relay. Before you start, check the breakers:
- RIH display is dark: check that CB1 is up (on).
- None of the fluid reels will flow: check that CB2 is up (on).
- Fuel dispenser has no power at all: check the dispenser’s own breaker. That’s usually a job for facilities maintenance or your equipment service company.
Need a spare RIH, a replacement relay, or help with these tests? Contact Fleetwatch Support.