High Electric Bills? Your Heat Strips May Be the Reason.
When winter electric bills spike in an Ellenton home with a Mitsubishi Electric system, heat strips are one of the first suspects — and one of the most misunderstood. Heat strips are electric resistance heating elements: simple, powerful, and expensive to run. They are supposed to assist your main heating system on the coldest days, not carry the load alone. When they fail — or when they run when they should not — the symptoms show up as high bills, lukewarm air, tripped breakers, or strange smells. This page explains how heat strips work, how they fail, and what professional Mitsubishi Electric heat strip replacement in Ellenton involves.
What Heat Strips Are and How They Work
Heat strips are coils of nichrome resistance wire mounted in the air handler. When electricity flows through them, they glow hot — the same principle as a toaster, scaled up to heat your home’s airflow. They are controlled by sequencers: electrical relays that stage the elements on one bank at a time, preventing a massive simultaneous current draw that would slam your electrical panel. In normal operation, the thermostat calls for auxiliary heat, the sequencer stages the elements on in sequence, the blower moves air across the glowing coils, and warm air reaches your rooms. Then they stage off when demand is met. It is a simple, robust design — which is exactly why failures are usually diagnosable with basic electrical testing rather than guesswork.
How Heat Strips Fail
Electric heating elements live hard lives — glowing hot, cooling down, thousands of cycles — and they fail in characteristic ways. Open elements: the nichrome wire breaks from thermal fatigue, and that bank of heat simply stops working. The system still heats, just with less capacity, so the remaining elements run longer and your bills climb while comfort slips. Stuck sequencers: the relay welds closed or fails to release, leaving elements energized far longer than they should be — or continuously. This is the failure behind mysteriously high bills with the system seemingly running normally. Shorted elements: a coil sags or breaks and contacts the housing, creating a short that trips breakers — the system’s protection working as designed, pointing directly at the fault. Failed contactors and wiring: pitted contacts, loose connections, or heat-damaged wiring interrupt or degrade element operation. Each failure has a distinct electrical signature, and our technicians diagnose with meters and amperage readings — not assumptions.
The Symptoms, Decoded
Heat strip problems announce themselves in specific ways. High electric bills with no change in habits are the classic sign — especially when the increase tracks with heating season. A stuck sequencer keeping elements on, or failed main heating forcing the strips to carry the load, both show up here. Lukewarm air from the vents when heat is called for suggests one or more element banks are open and the rest cannot keep up. Tripped breakers when the heat runs point to a shorted element or failing sequencer drawing abnormal current — reset once, and if it trips again, leave it off and call. Burning smells need discrimination: a dusty smell on the first heating cycle of the season is normal burn-off, but a persistent acrid electrical smell is not — shut the system off and call. Heat that never quite satisfies the thermostat on cold nights, with the system running constantly, often means the strips are doing a job they were not sized to do alone.
Diagnosis and Replacement: The Electrical Workup
Heat strip diagnosis is electrical work, and it follows a strict order for safety. Power is verified off and locked out before any hands go inside the air handler — this is non-negotiable with 240-volt heating elements. Each element bank is tested for continuity and resistance; an open element reads infinite resistance, a shorted one reads wrong. Sequencers are tested for proper staging — do they pull in sequence, and more importantly, do they release? Amperage draw is measured under load and compared to the rating: too high means a developing short, too low means lost capacity. Contactors, wiring, and high-limit safety devices are inspected for heat damage. The replacement uses genuine Mitsubishi Electric elements and sequencers matched to your air handler’s specifications — correct wattage, correct staging — because mismatched elements stress the electrical system they were not designed for. After replacement, the full staging sequence is tested under load, amperage verified, and safeties confirmed before the system is returned to service.
Why This Repair Matters Beyond the Bill
High bills get attention, but heat strip failures have a safety dimension worth taking seriously. Elements stuck on by a welded sequencer generate heat continuously — which is why high-limit safety devices exist, and why those safeties are tested as part of every repair. Shorted elements and damaged wiring are electrical faults in a high-current circuit, and electrical faults cause fires. A breaker that keeps tripping is protecting you; defeating that protection by repeatedly resetting it or upsizing the breaker is dangerous and we will tell you so directly. Professional heat strip replacement is not just about restoring efficiency — it is about making sure the highest-current circuit in your HVAC system is operating safely, with every safety device verified functional.
Mitsubishi Electric Heat Strip Replacement in Ellenton — Call Now
If your winter bills have spiked, your heat feels lukewarm, or breakers trip when the heat runs, our technicians serve Ellenton homes every day, and 24/7 emergency service covers the situations that cannot wait. When you call, describe the symptoms — when the bills changed, what the air feels like, whether breakers are involved — so the technician arrives ready for the electrical workup. Genuine Mitsubishi Electric parts, proper lockout procedures, and warranty-safe work come standard on every visit.
Why are my electric bills so high in winter?
Often because electric resistance heat — heat strips — is doing more work than it should. A stuck sequencer, failed elements forcing longer runtimes, or a main heating system underperforming all push the expensive backup into overdrive. An electrical diagnosis finds which one it is.
Can I just disconnect the heat strips to save money?
No — they are a designed part of your heating system, and disabling them can leave you without heat on the coldest nights and may create safety issues. The correct fix is diagnosing why they are misbehaving, not bypassing them.
Is a burning smell from the vents dangerous?
A brief dusty smell on the season’s first heating cycle is normal. A persistent acrid or electrical burning smell is not — shut the system off at the thermostat and breaker, and call for service. Do not keep running it to see if it goes away.
How long does heat strip replacement take?
Usually one visit. Diagnosis with electrical testing typically takes under an hour, and element or sequencer replacement is straightforward once the fault is identified. The full staging sequence is tested before we leave.
Will the repair be covered under warranty?
Depending on the system’s age and the failed component, possibly. We use genuine Mitsubishi Electric parts and warranty-safe procedures, document everything in writing, and can help you understand your coverage.