A mini-split that will not heat its zone in January, drips water from the indoor head, or flashes an error code and locks out is a system with a specific fault — and because each zone is its own system, the fault is usually findable fast: a clogged drain, a dirty filter, a refrigerant leak, or a sensor that has drifted. DNA Refrigeration repairs ductless mini-splits across Fort Collins. Call (970) 932-2324.
Mini-split repair is diagnosis zone by zone: the indoor head, the line set, and the outdoor unit are tested as a circuit, and the error code on the control board is the starting point, not the answer. A zone that will not heat, a head that drips water, or a system that locks out on an error code each point at a different part of that circuit.
The most common call is water. A mini-split indoor head makes condensate, and when the drain clogs, the pitch is wrong, or the drain pump has failed, the water comes out of the head instead of the drain. It looks alarming and it is usually a drain problem, not a refrigerant problem — but the two are easy to confuse, and the diagnosis is what tells them apart. In a Fort Collins winter, a drain that runs through an unheated space can also freeze, which shows up as a leak indoors.
The second most common call is a zone that will not heat. In a zone 5B winter, with a design temperature around 0°F (ASHRAE 99.6% value 0.1°F) and about 150 freezing nights a year, the causes are usually mundane: a filter that has not been cleaned in months, a dirty coil, a refrigerant charge that has dropped through a slow leak at a flare connection, or a sensor that has drifted out of calibration. Each one has a different test, and the flare connections — the most common leak point on any mini-split — are checked first.
Fort Collins sits at 5,003 feet, and the City’s mechanical guide puts furnace derating at 10–20% at this elevation — sea-level ratings do not apply here, so ductless mini-splits are sized from a Manual J load calculation at altitude, not from nameplate tonnage.
Every mini-split repair visit follows the same sequence: diagnose first, explain what failed, then repair and test. These are the six things that visit covers.
Each zone is tested on its own: the indoor head, the line set, and the outdoor unit. A fault in one zone does not mean the whole system is down — and the diagnosis is what tells you which zone, and which part, has actually failed.
The control board’s error code is the starting point. It narrows the fault to a sensor, a board, a communication error, or a refrigerant problem — and the code is verified with a meter, not taken on faith.
Pressures are measured against the manufacturer’s charging chart, and the flare connections — the most common leak point on a mini-split — are checked with a leak detector. Refrigerant handling follows EPA Section 608 rules.
The condensate drain is checked for clogs, pitch, and freeze damage, and the drain pump is tested where one is fitted. A head that drips water is usually a drain problem, and the drain is the first thing checked.
The indoor and outdoor units talk to each other over a communication wire, and a fault there looks like a dead zone. Wiring, sensors, and the control boards on both ends are tested.
Filters and coils are checked. A mini-split with a clogged filter cannot move air, and in heating mode that shows up as a zone that never reaches temperature — whatever the refrigerant readings say.
Call (970) 932-2324 any time, day or night — we are open 24 hours. We ask which zone is affected, what the indoor head is doing, whether water is dripping, and whether an error code is showing.
The technician reads the error code, tests the zone’s circuit — head, line set, outdoor unit — checks the drain, and measures refrigerant pressures. The failed component is identified before anything is replaced.
We show you the failed part, explain what it does, and lay out the options — repair now, or, where the system is old and the repair is a large share of replacement cost, the replacement picture too. Nothing is installed until you approve the work.
The part is replaced or the drain is cleared, the system is run through full heating and cooling cycles in the affected zone, and refrigerant charge is verified. The other zones are checked too.
Before leaving, we walk you through what failed and why, show you how to clean the filters, and note anything worth watching. That is also the moment to book the annual mini-split service visit.
Call (970) 932-2324 any time, day or night — we are open 24 hours. We ask which zone is affected, what the indoor head is doing, whether water is dripping, and whether an error code is showing.
Reads refrigerant pressures and verifies charge against the manufacturer’s charging chart.
Finds refrigerant leaks at flare connections, coils, and line sets. Refrigerant handling follows EPA Section 608 rules.
Tests sensors, control boards, communication wiring, and fan motors.
Verifies a deep vacuum after any refrigerant-circuit repair.
Cleans indoor-head coils and filters without damaging the fins.
Supply and return air temperatures confirm the zone is heating and cooling to specification after the repair.
A multi-zone mini-split in an Old Town home with one zone dead and the others working is usually a zone fault, not a system fault: a communication error, a failed sensor, or a flare leak on that zone’s line set.
After: We test the dead zone’s circuit on its own — head, line set, outdoor unit — and find the failed component. The other zones keep working while the one zone is repaired.
Call (970) 932-2324 →Water dripping from an indoor head is the most common mini-split call, and it is usually the condensate drain: clogged, wrongly pitched, or frozen where it runs through an unheated space.
After: We clear the drain, check the pitch, test the drain pump where one is fitted, and verify the head drains cleanly through a full cooling cycle before leaving.
Call (970) 932-2324 →A mini-split zone that will not heat in January is usually a filter, a coil, a charge, or a sensor. In a zone 5B winter the system is working at its hardest, and a fault that was invisible in October shows up in January.
After: We check the filter and coil, measure refrigerant pressures, test the sensors, and check the outdoor unit for icing. The failed component is replaced and the zone is run through a full heating cycle.
Call (970) 932-2324 →Most mini-split failures fall into a handful of patterns. Here are the ones we see most often, and how each one is diagnosed.
Ask a pro →We test the zone’s circuit — head, line set, outdoor unit — and read the error code. A dead zone is usually a sensor, a communication fault, or a refrigerant leak on that zone.
We check the condensate drain for clogs, pitch, and freeze damage, and test the drain pump. A dripping head is usually a drain problem, not a refrigerant problem.
We read the code, verify it with a meter, and test the component it points at. An error code is a starting point, not a diagnosis.
We check the filter and the coil. A mini-split with a clogged filter cannot move air, and in heating mode that shows up as a zone that never reaches temperature.
Colorado has no state HVAC licence — HVAC work in Fort Collins is licensed by the City of Fort Collins, not the state. Colorado licenses only electricians and plumbers at the state level. Fort Collins licenses HVAC contractors through the City — ask us for our licence details when you call. We pull a mechanical permit for replacements through the City’s Accela portal, and size equipment to ACCA Manual J. Refrigerant handling follows EPA Section 608 rules.
“This guy was amazing. Came to the house and within minutes he diagnosed the problem and had my refrigeration unit up and running like brand new. Would recommend 10 out of 10”
Rob WheelerGoogle review · a year ago
✓ Verified“Stand up guy. Stands behind his work.”
Kishore KodruGoogle review · 3 months ago
✓ VerifiedThe most common causes are a dirty filter or coil, a refrigerant charge that has dropped through a slow leak at a flare connection, a sensor that has drifted, or an outdoor unit iced over because the defrost cycle is not working. Check the filter first — it is the most common cause and the easiest to fix. If the zone still will not heat, the circuit needs diagnosis.
Usually the condensate drain: clogged, wrongly pitched, or frozen where it runs through an unheated space, or a drain pump that has failed. The water comes out of the indoor head instead of the drain. It is usually a drain problem, not a refrigerant problem — but the two are easy to confuse, and the diagnosis is what tells them apart.
Weigh the age, the repair history, and the cost of the repair against replacement. A single part on a younger system is a repair. A failed compressor on an old system, or a refrigerant circuit that has leaked repeatedly at the flares, usually points toward replacement. For cost context, Angi published $2,000–$5,000 for a typical single-zone system and $4,350–$12,250 for a ductless system in October 2026, checked November 2026.
Once a year, with the filters cleaned regularly in between — more often in wildfire-smoke season, when the filters load up fast. A mini-split that heats all winter is doing heat-pump duty, so the annual visit covers the same ground as a heat pump tune-up: coils, charge, defrost, drain, and sensors.
Tell us which zone is affected, what the indoor head is doing, and whether water is dripping or an error code is showing. We will diagnose the zone, show you what failed, and explain your options before any work starts. Call (970) 932-2324 — we are open 24 hours, every day.
Call Now (970) 932-2324 →Call us at (970) 932-2324 any time, day or night. We are open 24 hours, 7 days a week. There is no email address for the business — the phone is the way to reach us.