Machine Completely Dead — Power Diagnostics

Use a known-good lamp or outlet tester to confirm the wall outlet is providing power.

Expected: Lamp illuminates or tester indicates correct wiring.

Evidence to note: photo

Visually inspect the entire power cord from wall plug to machine inlet for cuts, kinks, burn marks, or loose connections. Ensure both ends are firmly seated.

Expected: Cord appears undamaged and both connections are secure.

Evidence to note: photo

With the machine unplugged, locate the main fuse holder inside the machine (typically near the power input area). Remove and visually inspect the fuse. If a multimeter is available, check for continuity across the fuse.

Expected: Fuse element is intact and continuity is confirmed.

Evidence to note: meter-reading

This step requires live-voltage measurement at the controller power input. If you are not trained for live-voltage work, hand off now. With appropriate PPE and tools, measure the voltage at the controller main power input connector.

Qualified technician handoff: stop before live electrical testing, sealed-system refrigeration work, compressor service, or protected-compartment access unless a qualified technician is handling the work.

Expected: Voltage reading consistent with machine rating (approximately 115V AC).

Evidence to note: meter-reading

If the controller has verified power input but the machine is still unresponsive, the controller or its firmware may be at fault. Check for any visible damage on the controller board. Attempt a power-cycle by unplugging the machine for 60 seconds and reconnecting.

Expected: Machine shows signs of life after power-cycle, or controller shows visible damage.

Evidence to note: photo

The wall outlet does not have power. Check the circuit breaker for this outlet. Contact the facility manager or electrician to restore power.

Expected: Outlet power restored by facility.

Evidence to note: note

The power cord is damaged. The machine must not be used until the cord is replaced. Arrange for a qualified technician to replace the power cord with a manufacturer-approved replacement.

Expected: Cord replaced and power restored safely.

Evidence to note: note

The main fuse has blown. Replace with the same type and rating. If the replacement fuse blows immediately, do not install a larger fuse — a short circuit exists. Hand off to a qualified technician.

Expected: Machine powers up with new fuse.

Evidence to note: note

Machine is now powered and responding. Verify display, try a test vend, and confirm refrigeration is running.

Qualified technician handoff: stop before live electrical testing, sealed-system refrigeration work, compressor service, or protected-compartment access unless a qualified technician is handling the work.

Expected: All basic functions operational.

Evidence to note: note

Diagnostics have reached a point requiring advanced electrical testing, proprietary controller diagnostics, or manufacturer support. Document all findings and hand off.

Expected: Qualified technician receives full diagnostic report.

Evidence to note: note

Check the machine's temperature setpoint in service mode. Confirm it is set appropriately for the product type (typically between 35°F and 40°F for chilled beverages).

Expected: Setpoint is within expected range.

Evidence to note: meter-reading

With the machine unplugged, visually inspect the condenser coil (typically at the rear or bottom of the machine). Check for dust, lint, or debris blocking airflow.

Qualified technician handoff: stop before live electrical testing, sealed-system refrigeration work, compressor service, or protected-compartment access unless a qualified technician is handling the work.

Expected: Condenser coil is visibly clean with open airflow passages.

Evidence to note: photo