Blowing cold air in heating mode
A reversing valve, thermostat, or defrost fault can leave the system cooling when it should be heating. The controls and the valve are tested to find which one it is.
No heat, no cool, icing up, or making noise — call and describe it
Heat Pump Repair Denver: Done Right
Heat pump trouble in January is usually urgent: the system blows cold air, ices over, or does not run at all. Call (720) 806-7634 and describe what is seen and heard, and the call talks through what to check and what comes next.
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Call (720) 806-7634 and describe what the heat pump is doing. Lion Tech Home Services talks through the symptoms and arranges a visit.
Call Now (720) 806-7634 → Open 24 hours · 7 days a week
Careful work. Honest options.
About this service
Heat Pump Repair in Denver: How We Work Through a Breakdown
A heat pump that stops heating or cooling usually has a cause found by testing: a failed capacitor or contactor, a stuck reversing valve, low refrigerant from a leak, a frozen coil, or a thermostat or control problem. The system is tested in order instead of guessing at parts.
Denver winters add their own failure modes. Outdoor coils ice up, defrost cycles get stuck, and auxiliary heat runs more than it should. In summer the same system can freeze a coil when airflow drops. A repair visit covers the full system, outdoor unit, indoor unit, refrigerant lines, and controls, so the fix lasts past the next cold snap.
- ✓ No heat or no cool
- ✓ Icing and defrost trouble
- ✓ Strange noises and smells
- ✓ Controls and thermostat faults
What's included
What Our Heat Pump Repair Includes
Diagnosis comes first, then the fix. That is the order on a typical call.
✓
Full system check
The outdoor unit, indoor unit, refrigerant pressures, airflow, and controls are tested, so the fault is found rather than guessed at.
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Plain explanation
What failed, what the repair involves, and what it will not fix are explained before any work starts. The decision is made with the facts in front of the homeowner.
✓
Common parts on hand
The parts that fail most often on heat pumps are carried, so many repairs are finished on the same visit when the part is available.
✓
Refrigerant leak check
Low refrigerant means a leak somewhere. It is looked for and talked through, instead of topping the system up and hoping.
✓
Defrost and icing check
The defrost cycle, sensors, and outdoor fan are tested. Icing that keeps coming back usually has a cause worth finding.
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Test before we leave
After the repair the system is run in heating and cooling, air temperature at the registers is checked, and the system is confirmed holding.
How it works
Our Heat Pump Repair Process
01
Call and describe it
Say what the system is doing, or not doing, and when it started. That shapes what is brought and what is tested first.
02
Test the system
Power, controls, refrigerant pressures, airflow, and the defrost cycle are checked, working through the system in order.
03
Explain the fault
What failed and what the repair involves are shown, including anything else found that is wearing out.
04
Repair and retest
The part is fitted or the repair is made, then the system is run in both modes and temperatures at the registers are checked.
05
Leave it running
What was done and what to watch for are walked through, and the system is left running and holding temperature.
Tools & methods
Tools and Methods We Use
Testing instruments, not guesswork, so the fault is found before parts are changed.
Manifold gauge set
Reads refrigerant pressures to tell a low-charge problem from a compressor or airflow problem.
Multimeter
Tests capacitors, contactors, motors, and control voltage to find electrical faults.
Thermometer and airflow checks
Supply and return temperatures show whether the system is moving heat or just moving air.
Leak detector
Finds refrigerant leaks at joints, coils, and valves so the leak is fixed, not just topped up.
Refrigerant recovery machine
Recovers refrigerant safely when a repair opens the sealed system.
Inspection mirror and light
Sees coil condition, wiring, and drain lines in tight spots.
Typical jobs
Before and After
Heat pump blowing cold air
Before
A heat pump in heating mode was blowing cold air and the auxiliary heat was running constantly. The house never reached the thermostat setting.
After
Testing found a failed reversing valve. Once replaced, the system heated normally and the auxiliary heat stopped running all day.
Outdoor unit icing over
Before
An outdoor unit kept icing up through winter, and the defrost cycle never seemed to clear it. Heating got weaker each week.
After
The defrost sensor and control were tested and the faulty sensor replaced. The unit now defrosts on schedule and the ice clears.
System short-cycling in summer
Before
A heat pump cycled on and off every few minutes in cooling mode, never quite cooling the house, and the electric use climbed.
After
A clogged filter and low airflow were the cause. With airflow restored and the coil cleaned, the system runs in longer, steadier cycles.
Problems we solve
Problems a Heat Pump Repair Solves
When a heat pump misbehaves, the symptom usually points at the cause. These are the ones seen most in Denver homes.
Ask a pro →↗
Icing on the outdoor unit
Some frost is normal in winter; a thick coat that never clears is not. The defrost cycle, sensors, and fan are tested to find why it is not clearing.
Running constantly without reaching temperature
Low refrigerant, weak airflow, or a failing compressor can all cause this. Testing the pressures and airflow narrows it down before anything is replaced.
Loud or unusual noises
Grinding, buzzing, or rattling from the outdoor unit usually means a fan, motor, or loose part. The source is found before it turns into a bigger failure.
About Lion Tech
Denver HVAC, Open Around the Clock
Lion Tech Home Services repairs heat pumps in Denver homes from 7575 E 29th Pl #4052, testing the full system before changing parts.
Customer reviews
What Denver customers say
Eleven Google reviews put Lion Tech Home Services at 5.0 stars.
★★★★★
“Martin does great work, is very transparent about costs, and most importantly backs up his work and will double back if needed without a question. I'll absolutely be using Lion Tech again when I need help around my homes.”
DE
Dominic EastGoogle review
✓ VerifiedIt may be a reversing valve or control fault, a defrost problem, or low refrigerant. It can also be the system running a defrost cycle, which blows cool air for a few minutes. If the cold air lasts, call and describe what is seen, and the valve, controls, and refrigerant will be tested.
Frost on the outdoor coil is normal in cold, damp weather, and the defrost cycle should clear it. If ice builds up thick and stays, the defrost sensor, control, or outdoor fan may be faulty, or airflow may be restricted.
Turn the system off at the thermostat if ice is thick and the fan is blocked, and call. Do not chip ice off the coil or pour hot water on it, since the coil fins and refrigerant lines are easy to damage.
It depends on the age of the system, the cost of the repair, and how often it has needed work. What the repair involves and what else is wearing will be explained, so repair can be weighed against replacement with real numbers in front of the homeowner.
Ready when you are
Get Your Heat Pump Fixed
Call (720) 806-7634 and describe what the heat pump is doing. Lion Tech Home Services will talk through the symptoms and arrange a visit.
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Request an appointment
Contact Lion Tech Home Services
Lion Tech Home Services, Denver — call (720) 806-7634, open 24 hours.