ECG (electrocardiogram) machines are essential diagnostic tools in virtually every healthcare setting. When they fail, it can delay patient diagnosis and disrupt clinic workflow. Understanding common failure modes helps your staff respond effectively and minimize downtime.
1. Lead Wire Damage
The most common ECG failure is damaged or worn lead wires. Frequent use, improper storage, and accidental pulls cause internal wire breakage. Signs include intermittent signal dropout, noise artifacts, or complete signal loss on specific leads.
What to do: Inspect lead wires for visible damage. Try a known-good set of leads before calling for service. Replace lead wires at the first sign of intermittent connections.
2. Poor Electrode Contact
Noisy or wandering baselines are often caused by poor skin-electrode contact rather than machine failure. Dry skin, body hair, or expired electrodes can all reduce signal quality.
What to do: Ensure proper skin preparation — clean the area with alcohol, allow to dry, and use fresh electrodes. If the problem persists with good technique, the issue may be with the machine.
3. Power Supply Issues
Battery degradation or charging circuit failures cause unexpected shutdowns. Machines that won't power on or lose charge quickly typically have battery issues.
What to do: If the machine won't turn on, try a different outlet first. Check battery age — most ECG batteries last 2-3 years with regular use. Battery replacement is a routine service call.
4. Software Glitches
Modern ECG machines run complex software that can freeze, crash, or produce incorrect measurements after updates or power surges.
What to do: Perform a power cycle (turn off, wait 30 seconds, turn on). If problems persist after a restart, contact your service provider — a software recalibration may be needed.
5. Printer and Thermal Head Failures
ECG machines with built-in printers can experience paper jams, faded printouts, or complete print failure. Thermal print heads wear out with use.
What to do: Check paper alignment and replace the thermal paper roll. Clean the print head with isopropyl alcohol. If printouts remain faded after cleaning, the thermal head likely needs replacement.
When to Call Zoetek Medical
If basic troubleshooting doesn't resolve the issue, contact Zoetek Medical at (800) 388-6223. Our factory-trained technicians provide same-day emergency service and can diagnose and repair most ECG machines on-site. Regular preventative maintenance can catch many of these issues before they cause downtime.