Heat Pump Repair Quincy MA — Same-Day Service, All Brands, Both Seasons
Heat Pump Repair & Service in Quincy MA — Wollaston · North Quincy · Marina Bay · Adams Shore · Squantum · Houghs Neck · All ZIP codes 02169 · 02170 · 02171
Heat Pump Not Working in Quincy? What to Check Before Calling Heat Pump Repair Quincy MA
Run through this in two minutes it resolves a meaningful percentage of calls without a service visit:
System not heating:
Check the thermostat mode confirm it shows “Heat” not “Cool,” “Dry,” or “Fan.” Check the outdoor temperature setting on your thermostat some systems have a balance point setting that switches to auxiliary heat below a certain temperature, and if auxiliary heat is not connected, the system may appear to stop working. Check the outdoor unit make sure it is not buried in snow or ice. A blocked outdoor unit will shut down on a protection fault.
System not cooling:
Check the remote or thermostat mode confirm it shows the snowflake (❄) symbol. Check the air filter on the indoor unit mini split filters should be rinsed every 4–6 weeks during heavy use. A clogged filter will dramatically reduce cooling output and mimic a refrigerant problem.
Error code showing on indoor unit:
Note the code before calling — it tells us what the system has detected and helps us arrive with the right parts. Different brands use different codes: Mitsubishi uses P-codes and E-codes, Daikin uses U-codes, Fujitsu uses error flashes counted in sequences.
Outdoor unit not running at all:
Check your circuit breaker for a tripped breaker on the heat pump circuit. Reset once. If it trips again immediately, do not reset again call us.
Heat Pump Repair Quincy MA
- System not heating
- System not cooling
- Error code showing on indoor unit
- Outdoor unit not running at all
If none of the above resolves it Call (617) 928-8469. Everything from here requires a licensed technician.
(617) 928-8469Who This Page Is For
- Quincy homeowners whose heat pump stopped heating in the middle of winter
- Coastal homeowners in Wollaston, Marina Bay, Squantum, and Adams Shore with systems degraded by salt air
- North Quincy condo owners with Mitsubishi or Daikin systems showing error codes
- Homeowners who replaced oil heat with a heat pump and are experiencing their first winter with the system
- Anyone who called a general HVAC company and was told their heat pump “can’t be repaired” without a second opinion
Heat pump showing an error code or running but not performing?
A proper diagnosis costs $85–$125. A misdiagnosis can lead to replacing a system that may only need a repair.
(617) 928-8469Book Same-Day Diagnostic →
Heat Pump Problems We Diagnose and Fix in Quincy MA
Not Heating in Winter Most Common Cold-Season Call
The heat pump runs but produces little or no heat. Four causes cover the vast majority of cases:
Refrigerant Leak
Heat pumps use refrigerant for both heating and cooling. A slow leak can reduce heating performance first because heating mode places more demand on the refrigerant circuit.
The system may cool normally in summer but struggle to heat in January as refrigerant levels drop.
Fix: Locate the leak, repair the damaged area, and recharge the system.
Cost: $200–$600 depending on leak location.
Reversing Valve Fault
The reversing valve controls the direction of refrigerant flow between heating and cooling mode. A failed valve can leave your heat pump stuck in one mode.
Symptoms: Cooling when heating is selected or heating when cooling is selected.
Fix: Reversing valve replacement.
Cost: $350–$700.
Defrost Board or Sensor Failure
The defrost control board manages the outdoor coil defrost cycle. A failed board or sensor can cause icing, poor heating, or unnecessary defrost cycles.
Fix: Replace the failed board or sensor.
Cost: $250–$550.
Outdoor Unit Iced Over Completely
A solid block of ice around the outdoor unit is not normal. It usually indicates a defrost failure or severely low refrigerant.
Turn the system off to prevent compressor damage and schedule an inspection.
Not Cooling in Summer — Most Common Warm-Season Call
Common causes include refrigerant leaks, dirty condenser coils, failed capacitors, or incorrect thermostat settings.
Diagnosis: All major causes can be checked during one service visit.
Short-Cycling — Turns On and Off Rapidly
The system starts, runs briefly, shuts off, and repeats. This can indicate pressure problems, dirty coils, low refrigerant, or compressor issues.
Loud or Unusual Noises From the Outdoor Unit
Grinding: Possible compressor bearing failure.
Rattling: Loose components or fan blade contact.
Gurgling: Possible refrigerant issue if abnormal.
Thumping: Possible compressor valve problem.
Water or Ice Damage to Outdoor Unit
Quincy’s freeze-thaw cycles can create ice buildup around outdoor units. We inspect mounting, leveling, drainage, and refrigerant lines before restarting equipment.
What We Check on a Heat Pump Diagnostic
A heat pump diagnostic is more involved than a standard AC service call the system operates in two modes and the refrigerant circuit behaves differently in each direction:
What We Check During a Heat Pump Diagnostic
Outdoor Unit Inspection
- Refrigerant pressures in heating and cooling mode
- Reversing valve operation using temperature differential testing
- Compressor amperage draw compared with manufacturer rating
- Defrost control board and outdoor temperature sensor operation
- Coil condition including salt deposits, corrosion, and fin damage
- Refrigerant fittings checked for oil staining and leak indicators
- Fan motor amperage and blade condition
- Electrical connections and disconnect condition
Indoor Unit Inspection
- Supply and return air temperature difference in heating and cooling mode
- Filter condition and airflow measurement
- Blower motor operation
- Condensate drain inspection during cooling operation
- Control board and stored error code history
- Communication wire continuity between indoor and outdoor units
Electrical & Controls Testing
- Thermostat or remote calibration and operating mode confirmation
- Circuit breaker and dedicated circuit amperage
- Electrical panel condition, including older Quincy homes
The diagnostic cost is disclosed when you schedule. If you approve the repair, the diagnostic fee is applied toward the repair cost.
Heat Pump Repair vs. Replacement — The Honest Framework
Heat pump repair follows the same $5,000 rule as any HVAC system: repair cost × age in years. Over $5,000 replacement math usually wins. Under $5,000 repair.
But heat pump replacement has the Mass Save rebate dimension that changes the calculation:
Repair or Replace? We Show You the Math
| Repair Scenario | Age | $5,000 Rule | Recommendation |
|---|---|---|---|
| Capacitor, sensor, or minor repair under $300 | Any | Under threshold | Repair — straightforward |
| Refrigerant leak repair $400–$600 | Under 10 years | Under threshold | Repair — system has significant life |
| Reversing valve replacement $500–$700 | Under 8 years | Under threshold | Repair |
| Reversing valve replacement $500–$700 | Over 12 years | Over threshold | Get replacement quote with rebate |
| Compressor replacement $1,200–$2,200 | Over 8 years | Likely over | Compare vs new system net of rebate |
| Any major repair | Over 15 years | Over threshold | Replace — Mass Save rebate applies |
| Cracked heat exchanger (ducted) | Any | N/A | Replace immediately |
When a repair cost approaches $800+ on a system over 10 years old, we run the replacement math alongside the repair quote — showing gross cost, Mass Save rebate, and net out-of-pocket for a new system.
You decide with both options in writing.
Real Job, Real Result — Before & After
Case Study 1: Reversing Valve Fault — Wollaston, Quincy MA
The Situation
A homeowner on Beale Street in Wollaston called in early February. Their 8-year-old Mitsubishi MXZ-3C24NAHZ 3-zone heat pump had been producing lukewarm air from all three zones since January. Indoor temperatures were 59–62°F despite the thermostat set to 70°F. A competing company quoted $4,200 to replace the outdoor unit, stating the compressor was probably failing.
Before
System operational but severely underperforming in heating mode. Competing quote: $4,200 for outdoor unit replacement with no diagnostic basis for the compressor claim.
What We Found
Refrigerant pressures were within 8% of specification, confirming the compressor was operating normally. Temperature differential across the reversing valve measured only 2°F instead of the expected 15–25°F. The reversing valve solenoid coil had failed.
What We Did
Replaced the reversing valve solenoid coil. Written estimate before work: $285 total including solenoid coil, labor, and system retest. Temperature differential improved to 22°F after repair.
Case Study 2: Coastal Coil Degradation — Marina Bay, Quincy MA
The Situation
A Marina Bay homeowner called in June. Their 6-year-old Daikin 2-zone heat pump cooled adequately in mild weather but could not maintain temperature above 85°F outdoor conditions. Bedroom zone reached 78°F on 90°F days despite thermostat set to 70°F.
Before
System running with no error codes but poor cooling performance during peak load. Homeowner suspected a refrigerant recharge was needed.
What We Found
Refrigerant charge was within 4% of specification. The outdoor condenser coil had severe salt and mineral buildup from waterfront exposure. Approximately 60% of the fin surface was blocked.
What We Did
Performed professional coil cleaning using alkaline coil cleaner, rinse, marine-grade protective coating, and system retest. Written estimate before work: $195.
Heat pump underperforming or showing an error code? Get a proper diagnosis before authorizing any major repair.
(617) 928-8469Book Your Diagnostic →
Flat-fee diagnostic, written estimate, no pressure.
We bring the test equipment to diagnose correctly — not guess.
Heat Pump Repair Pricing in Quincy MA
| Repair | Typical Cost |
|---|---|
| Diagnostic / service call | $85–$125 (applied toward repair) |
| Reversing valve solenoid coil | $200–$350 |
| Reversing valve replacement (full) | $450–$700 |
| Defrost control board | $250–$550 |
| Outdoor temperature sensor | $85–$175 |
| Run capacitor replacement | $150–$250 |
| Contactor replacement | $125–$200 |
| Refrigerant recharge (R-410A) | $200–$450 |
| Refrigerant leak repair (minor) | $250–$500 |
| Coil cleaning (coastal — heavy fouling) | $150–$250 |
| Marine-grade coil coating | $150–$250 |
| Communication wire repair | $125–$250 |
| PCB / control board replacement | $350–$700 |
| Compressor replacement | $1,200–$2,200 |
| Emergency / after-hours diagnostic | $145–$175 |
Written estimates before any work starts.
At repair costs over $800 on older systems, we present a side-by-side replacement quote including Mass Save rebate amounts.
What Quincy Homeowners Say About Our Heat Pump Installation Quincy
Another company said I needed a $4,200 outdoor unit. These guys found a $65 solenoid coil and charged me $285. I can’t say enough about getting a second opinion.
Thomas H., WollastonHeat pump was barely keeping up in July. They cleaned the coils which were caked with salt from the marina and it was like having a new system. Never occurred to me that was the problem.
Susan M., Marina BayThorough, honest, and fast. They told me exactly what was wrong, showed me the pressure readings, and explained what the numbers meant. I felt like I actually understood what I was paying for.
Kevin L., North QuincyHeat pump underperforming or showing an error code?
Get a proper diagnosis before authorizing any major repair.
(617) 928-8469Book Your Diagnostic →
Got Questions?
We’re happy to help. If you can’t find the info you’re looking for, please don’t hesitate to reach out to us!
Three possibilities one of which is not a problem at all. First: the system is in defrost mode, which is normal and lasts 5–15 minutes. During defrost, the outdoor fan stops and the indoor unit may blow slightly cool air. Wait 15 minutes and see if normal heating resumes. Second: the system is set to “Cool” or “Fan” mode instead of “Heat” check the thermostat or remote. Third: the reversing valve is stuck or faulty, or the refrigerant charge is low. Both require a service call.
Yes Mitsubishi is the most common heat pump brand in Quincy’s market. We service the full Mitsubishi Electric residential range including MSZ, MXZ, SEZ, and SUZ series. We also service Daikin, Fujitsu, LG, Bosch, Carrier, Trane, and all other major residential brands. If your system is under manufacturer warranty, we confirm before starting whether warranty work requires a factory-authorized dealer.
It depends on the noise. Grinding or metal-on-metal scraping turn it off immediately and call us. These indicate a compressor or fan bearing failure that worsens rapidly under load. Loud rattling shut down and call. Gurgling or bubbling sounds these can be normal refrigerant flow noise; only concerning if they are new or louder than usual. Hissing possible refrigerant leak; call us. When in doubt, shut it down and call rather than risk a $300 repair becoming a $2,000 compressor replacement.
Once a year is the standard recommendation ideally in spring before the cooling season. For heat pumps in Quincy’s coastal neighborhoods (Wollaston, Marina Bay, Squantum, Adams Shore, Houghs Neck), twice a year is worth considering. Salt air deposits on condenser coils accumulate year-round and annual cleaning at the very minimum is necessary to maintain efficiency and extend equipment life.
We use the $5,000 rule repair cost × system age. Under $5,000: repair. Over $5,000: get a replacement quote alongside the repair estimate. The key factor specific to heat pumps in 2026 is the Mass Save rebate a new qualifying system qualifies for up to $8,500 back, which significantly changes the replacement math compared to other system types. We provide both options in writing when the repair cost warrants it.
This is the classic early-stage refrigerant leak pattern. Cooling mode operates at lower refrigerant pressures than heating mode a system with a marginally low refrigerant charge can still cool adequately while struggling to heat. As the leak progresses through autumn and into winter, the charge drops further until heating performance collapses. The fix is locating and repairing the leak, then recharging to specification. Topping up refrigerant without fixing the leak is a temporary measure that delays the inevitable and doesn’t address the root cause.
If you still have questions or your heat pump is not performing correctly, call for heat pump repair.
(617) 928-8469Heat pump not working right now? Call (617) 928-8469 — answered 24 hours a day. Tell us your brand, what it’s doing, and your Quincy neighborhood. We dispatch same-day.
📅 Underperforming but not completely down? Book a Diagnostic → — 7am–7pm Mon–Sat. Flat-fee, written estimate, no pressure to proceed.
💰 Repair cost coming in high on an older system? Heat Pump Installation Quincy MA → — Mass Save rebates up to $8,500 make replacement math very different in 2026.
🔧 Need annual maintenance to prevent the next breakdown? AC Maintenance Quincy MA → — one visit a year prevents most heat pump service calls.