When temperatures drop across the Midwest, your heat tracing system carries the full weight of keeping pipelines, instrumentation, and critical infrastructure running safely. Most failures don’t happen because heat trace “doesn’t work” — they happen because a small, preventable issue was left unchecked until the cold made it a big one. Below, the RELCON team breaks down the most common heat tracing problems we see every winter, why they happen, and how proactive maintenance keeps your facility protected.
Nuisance Ground-Fault (GFEPD) Trips
One of the most frequent service calls we get during the first hard freeze is for circuits that keep tripping their ground-fault equipment protection device (GFEPD). While a genuine ground fault should always be investigated, nuisance trips are often caused by:
- Moisture intrusion at splices, end seals, or power connection kits that were not properly sealed
- Damaged cable jacketing from installation abrasion, wildlife, or UV degradation over multiple seasons
- Aging cable that has reached the end of its serviceable life and is leaking current as insulation resistance drops
A repeat trip is a warning sign, not an inconvenience — it means the circuit is telling you something before it fails outright.
Moisture Intrusion at Terminations and Splices
Every point where heat trace cable is cut, spliced, or terminated is a potential entry point for water. Once moisture works its way past a compromised seal, it can freeze, expand, and destroy the connection from the inside. This is one of the top reasons RELCON recommends Chemelex (Raychem) connection kits and factory-trained installation — a properly sealed splice or end termination is the difference between a system that lasts decades and one that fails its first hard winter.
Undersized or Poorly Designed Systems
Heat tracing is an engineering exercise, not a one-size-fits-all product. Problems show up when a system was designed around rough assumptions instead of accurate heat-loss calculations. Common design gaps include:
- Pipe insulation that was undersized, damaged, or omitted after installation
- Circuit lengths that exceed the cable’s maximum run for the available voltage
- Failure to account for wind exposure, elevation, or true regional design temperatures
A system engineered for “average” Midwest winters will struggle the moment temperatures drop below design assumptions — which is exactly when you can least afford a failure.
Controller and Sensor Malfunctions
Modern heat trace systems rely on electronic controllers and temperature sensors to cycle power efficiently and safely. When these components drift out of calibration, fail, or are programmed incorrectly, the results range from wasted energy to unprotected pipe. Watch for:
- Sensors placed too far from the pipe surface, causing inaccurate temperature readings
- Controllers left on outdated setpoints from a prior season or a different process
- Communication faults in networked or SCADA-integrated control systems
Panel and intelligent controller programming is one of the most requested services on our troubleshooting calls — and often one of the fastest fixes once the root cause is identified.
Voltage Drop and Circuit Overload
Self-regulating heat trace cable draws more current as ambient temperatures fall, which means circuits that were fine in October can be pushed to their limits in January. Long circuit runs, undersized breakers, or shared loads on the same panel can all lead to voltage drop severe enough to leave the far end of a pipe run under-protected.
Damaged or Deteriorated Insulation
Heat trace cable is only as effective as the insulation covering it. Torn, wet, or missing insulation — often the result of contractor foot traffic, wildlife, or age — lets heat escape faster than the cable can replace it. This is one of the easiest problems to miss visually and one of the most common findings during a RELCON system audit.
Deferred Maintenance
The single biggest driver behind cold-weather heat trace failures is simple: systems that haven’t been inspected since they were installed. Heat tracing is largely out of sight, out of mind — until a frozen line shuts down production or triggers a fire sprinkler failure. An annual pre-season inspection catches degraded connections, nuisance-trip patterns, and controller drift before the first freeze, not after.
How RELCON Keeps Your System Winter-Ready
RELCON Inc. has spent four generations engineering commercial, industrial, and utility freeze protection — not guessing at it. As a strategic partner of Raychem and a Honeywell Diamond Channel Partner, our team offers:
- Complete System Audits covering energy efficiency, equipment performance, compliance and safety, and maintenance practices, with a detailed report of findings and recommendations
- Heat Trace Troubleshooting including panel and intelligent controller programming, cable and component diagnostics, and system optimization
- Training, Start-Up, and Commissioning so your team understands the system and installs it correctly the first time
- Custom Project Design built around real Midwest weather data, not rough estimates
Don't Wait for the First Hard Freeze
The problems above rarely announce themselves until a pipe is already frozen. A short inspection now can prevent a costly shutdown later.
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