Heating Repair in Coral Terrace

The heating half of the system is the part nobody in Coral Terrace thinks about, and in a climate like this it is as often as not the same outdoor unit that cools in July, running the other way. A household can live with a heat pump for years without knowing the machine does both jobs, which is why the first thing worth saying on the phone is which of the two heats the house.

Where the heat comes from a heat pump, no heat usually means it stopped heating rather than stopped running. The part that decides which job the machine is doing is the reversing valve, and one that sticks leaves an outdoor unit sounding normal and air at the registers that never warms. Where a small gas furnace does the heating instead, the list is the familiar one: flame sensor, ignitor, pressure switch, limit switch.

Air from the vents that feels cool in winter is not a fault by itself — a heat pump works on a smaller difference between the room and the air it supplies, and it runs longer cycles to make that up. What matters is whether the room gets to the number on the thermostat, and whether the electric strips are doing work the heat pump should be doing: a thermostat set or wired wrong brings them on when the weather never asked for them.

Where July dew points sit at 70°F and above, the indoor coil runs wet all summer, and everything it pulls out of the air leaves by one drain line. A summer of that grows a film inside the trap and the line, and nobody thinks about a drain on the first cold night: a condensing furnace makes water of its own, in most installations it goes down that same line, and a line that will not take it backs the water up until the pressure switch refuses to close. In a climate like this a no-heat call can end at the drain and never reach the burner.

This close to the ocean, salt air works on the outdoor unit first, and where a heat pump makes the heat, that cabinet is the heating system. A coil with corroded fins takes heat out of cold air less well every winter, and a defrost sensor that has lost its grip on the coil leaves the unit to ice up with nothing to tell it to clear itself.

A new filter is the one thing off a hardware-store shelf that ends a no-heat call outright, and it is fair to say so: a filter loaded solid chokes the return, the heat exchanger cannot put its heat into air that is barely moving, the limit switch opens, and the furnace shuts itself down and short cycles. What a new filter cannot do is prove it was the fault. Where the furnace locks out again within a day of a new one going in, the air was restricted somewhere past the filter, and a technician measures the temperature rise across the furnace to find where.

Cleaning the flame sensor is the other place where a hand and a rag do something, and it comes with a limit. A rod coated in what the flame leaves behind stops proving the flame, the gas valve closes a few seconds after it opens, and a rod wiped clean proves flame again. What it never answers is why the rod fouled: the coating comes off the flame itself, so a sensor that wants cleaning twice in one season is reporting combustion rather than dirt, and combustion is not a hardware-store question. An ignitor bought off a shelf is a different matter again — it is a stocked part, and it is also the part people replace twice, because an ignitor that glows and still does not light is pointing at the gas valve or the wiring to it rather than at itself.

Past those two, what the shop can sell stops reaching the fault. A thermostat is the purchase people make next, and on a cold night it usually adds a problem of its own: the old one comes off the wall before anyone writes down which wire sat on which terminal, and a no-heat call becomes a no-heat call with the controls in pieces. Electric heat plugged into a wall socket will bridge one night, and that is a fair use of it, though several units on one circuit trip the breaker — and a gas range with the oven door open is the one improvisation that puts combustion products into the room people are sleeping in.