24/7 Emergency Heat Pump Repair Across Long Island
Heat pumps are increasingly common on Long Island as homeowners take advantage of NYS Clean Heat and federal Section 25C rebates to switch from oil and gas to electric heating. They're efficient and quiet, but heat pump diagnosis is its own specialty: you need a tech who understands the heating mode AND the cooling mode (since it's the same equipment running in reverse), plus the defrost cycle that distinguishes heat pumps from regular AC, plus the inverter-driven variable-speed compressors used by most cold-climate models.
All Island Comfort is a participating NYS Clean Heat installer and dispatches heat-pump specialists across Long Island 24/7. We work on all the major air-source brands: Mitsubishi (Hyper-Heat), Daikin (Aurora), Carrier Infinity, Lennox SLX, Bosch IDS, and the rest. Our trucks carry refrigerant (R-410A, R-32, R-454B), defrost-board parts, reversing-valve solenoids, common sensors, and the diagnostic tools required for each brand.
If your heat pump is blowing cool air in heating mode, blowing warm air in cooling mode, the outdoor unit is iced over and not defrosting, the system is short-cycling, or showing an error code, call us. We'll triage on the phone and dispatch with the right parts.
Heat Pump Down? Call Now.
Real heat-pump specialists 24/7. Heating or cooling mode, all major brands.
Call 631-591-2289Every Heat Pump Type We Repair
Long Island has air-source heat pumps in increasing numbers (driven by NYS Clean Heat). Our crew works on all of them.
- Cold-climate air-source heat pumps (ccASHP): Mitsubishi Hyper-Heat, Daikin Aurora, Carrier Infinity, Lennox SLX, Bosch IDS, Trane Mitsubishi-built. Maintain capacity at 5°F and below.
- Standard air-source heat pumps: Pre-cold-climate models that lose capacity below 35-40°F. Often paired with electric resistance backup. Common on installs from before 2018.
- Ductless mini-split heat pumps (single-zone): Wall-mounted indoor head + outdoor condenser. Most common in additions, basements, and zone-by-zone retrofits.
- Ductless mini-split heat pumps (multi-zone): One outdoor unit driving 2 to 8 indoor heads. Common in whole-home retrofits.
- Ducted central heat pumps: Outdoor condenser + indoor air handler with traditional ductwork. The heat-pump version of central AC.
- Geothermal (ground-source) heat pumps: Loop-field installations using earth as the heat source/sink. Less common but very efficient. Specialty diagnostics.
- Air-source heat pump water heaters: A.O. Smith Voltex, Rheem ProTerra. Eligible for federal Section 25C tax credit ($2,000).
- Inverter-driven variable-speed heat pumps: Modern heat pumps with continuously variable compressor speed. Communicating control diagnostics.
- Two-stage heat pumps: Heat pumps with high-fire and low-fire stages.
- Single-stage heat pumps: Older fixed-capacity heat pumps.
- Reversing valves: Four-way valves that switch the system between heating and cooling. Solenoid replacement and stuck-position diagnostics.
- Defrost boards & sensors: Outdoor coil temperature sensors, defrost boards, and timed-versus-demand defrost diagnostics.
- Inverter modules & PCBs: Variable-speed compressor drives. Brand-specific replacement and diagnostic tools.
- Auxiliary electric heat strips: Electric resistance backup heat in air handlers. Sequencer, contactor, and element diagnostics.
Common Heat Pump Emergency Symptoms
Heat pumps fail in heating-mode-specific and cooling-mode-specific ways, plus the unique defrost-cycle failures that don't apply to regular AC.
Heat Pump Blowing Cool Air in Heating Mode
System is in heat mode but the air at the registers is room-temperature or cool. Causes: low refrigerant, stuck reversing valve (system is actually still in cooling mode internally), defrost cycle running, outdoor unit iced over, or compressor not pumping. Diagnosis confirms quickly.
Heat Pump Blowing Warm Air in Cooling Mode
Same diagnostic flow as central AC: capacitor, contactor, refrigerant, compressor, or stuck reversing valve.
Outdoor Unit Iced Over and Not Defrosting
Some ice on the outdoor coil during cold weather is normal. Heavy ice that doesn't clear means the defrost cycle isn't running. Causes: failed defrost board, failed outdoor coil sensor, failed reversing valve, or refrigerant problem. Common cold-weather emergency.
System Short-Cycling in Heating Mode
Heat pump cycles on and off rapidly without satisfying the thermostat. Causes: oversized for the load, failed pressure switch, refrigerant pressure problem, or thermostat too far from the equipment.
Auxiliary Heat Always Running
Electric resistance backup is supposed to engage only on call from thermostat or in defrost. If it runs constantly, the heat pump itself isn't keeping up. Causes: refrigerant low, outdoor coil fouled, undersized for the design temp, or thermostat configured wrong.
Heat Pump Won't Switch Between Heating and Cooling
Reversing valve stuck. The four-way valve solenoid has failed. Replacement is the fix.
Strange Noises (Banging, Clanking)
Reversing valve slams during mode change can sound alarming but is usually normal. Persistent banging or clanking during operation suggests a loose component, failing fan motor, or compressor problem.
Error Code on Indoor Display
Modern heat pumps (especially mini-splits) display error codes that point to specific failures. Tell the dispatcher the brand and code when you call.
Outdoor Unit Iced Over?
Some ice in cold weather is normal. Heavy ice that won't clear is a defrost-cycle failure. Call us, don't try to chip the ice off (you'll damage the coil).
Call 631-591-2289Our 4-Step Rapid Response for Heat Pump Emergencies
- 1Triage on the call. A real Long Island dispatcher answers and walks through your symptoms. We rule out anything you can fix in 60 seconds (thermostat, breaker, reset button), then dispatch immediately. No phone tree, no offshore call center.
- 2Local tech to your door. Typical response is 1 to 3 hours across Suffolk and Nassau, faster for the North Shore corridor between Wading River and Port Jefferson. Your tech texts when 15 minutes out.
- 3Diagnose and quote before any wrench moves. Flat diagnostic fee, written quote on-site, your written approval before any repair starts. No surprise charges, no upselling.
- 4Restore heating or cooling tonight when possible. About 85% of our heat pump emergency calls finish on the first visit because the trucks carry refrigerant (R-410A, R-32, R-454B), defrost-board parts, reversing-valve solenoids, common sensors, and capacitors. Brand-specific PCB and inverter-module replacements may require next-day order.
What to Do While You Wait for the Technician
- Note any error code on the thermostat or indoor head. Tell the dispatcher when you call.
- Check the air filter. Severely restricted filters cause many heat pump performance complaints.
- If the outdoor unit is iced over, do not try to chip or hammer the ice off. You'll damage the coil. Wait for us.
- Verify the thermostat is set to HEAT (in winter) or COOL (in summer) and at a temperature different from current room temp.
- Check the auxiliary heat (Aux/Em Heat) switch on the thermostat. If set to Em (Emergency) Heat, the heat pump won't run, only the electric backup will.
- Replace thermostat batteries if the screen is blank or dim.
- Check the breakers for both the indoor air handler and the outdoor heat pump unit.
Why Long Island Trusts Us With Heat Pump Emergencies
- 22+ years on Long Island. Family-owned in Wading River since 2004. We know the housing stock and the equipment families.
- A real person answers, day or night. 24/7/365 dispatch from a local Long Island number, not an answering service.
- Heavily stocked trucks. Most calls finish on the first visit because the parts that fail most often live on every truck.
- Cross-trained on every fuel and system. Gas, oil, electric, propane, heat pump, hydronic, steam, radiant. One company, no subcontracting.
- Licensed for everything we do. HVAC, plumbing, oil-burner, gas-fitting, EPA Section 608 refrigerant. Insurance certificates on request.
- Flat, transparent pricing. Diagnostic fee disclosed on the phone. Repair quote in writing before work starts. After-hours premium disclosed up front.
- Service plan members skip the line. Annual maintenance plan members get first dispatch priority and reduced after-hours rates.
Long Island Service Area for Emergency Heat Pump Repair
We dispatch heat-pump specialists to all of Suffolk and Nassau counties from our Wading River base. NYS Clean Heat participating contractor.
Suffolk County
- Wading River
- Riverhead
- Mount Sinai
- Rocky Point
- Shoreham
- Miller Place
- Port Jefferson
- Setauket
- Stony Brook
- Smithtown
- Huntington
- Northport
- Centereach
- Patchogue
- Sayville
- Manorville
- Calverton
- Mattituck
- Cutchogue
- Greenport
- Westhampton
- Hampton Bays
- Southampton
- East Hampton
Nassau County
- Hempstead
- Oyster Bay
- Long Beach
- Garden City
- Hicksville
- Levittown
- Massapequa
- Mineola
- Freeport
- Westbury
- Plainview
- Syosset
- Bethpage
- Farmingdale
- Manhasset
- Great Neck
- Port Washington
- Roslyn
- Glen Cove
- Rockville Centre
- Valley Stream
- Lynbrook
- Wantagh
- Bellmore
Related Emergency Services
If your heat pump is a ductless mini-split specifically, see the dedicated mini-split page. If you have central AC (not heat pump) or a furnace, jump to the right page below.
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Emergency Mini Split Repair
Ductless mini-split blowing warm, leaking, or showing fault codes. All major brands handled.
Available 24/7 -
Emergency AC Repair
AC not cooling, blowing warm, or not turning on. Critical when temps and humidity spike.
Available 24/7 -
Emergency Heating Repair
Heat is out, equipment silent or not warming. Any heating system, gas, oil, electric, or hydronic.
Available 24/7 -
Emergency HVAC Repair
Heating or cooling failure of any kind. Generalist dispatch when the cause is not clear.
Available 24/7
Related Standard Services
If it's not an after-hours emergency, our standard service pages cover routine repair, replacement, and tune-ups at non-emergency rates.