Air conditioner repair in Grimsby

An air conditioner that trips its breaker is drawing more current than the circuit allows. The usual causes are a failing run capacitor, which makes the compressor struggle to start, a contactor with burnt or pitted contacts, a chafed wire inside the outdoor cabinet, or a compressor with a shorted winding. Resetting the breaker over and over makes the wiring and the compressor run hot each time, and a weak start can turn a capacitor fault into a compressor fault.

If the breaker trips more than once, set the thermostat to off and leave the breaker off until a technician has tested the unit. The same applies to a burning smell at the supply registers or the indoor unit, which often points to the blower motor in the furnace cabinet, since the air conditioner uses the furnace fan to move air through the house.

Go outside and look at the condenser while the system is calling for cooling. If the fan is still and the unit hums, the capacitor or the fan motor has usually failed, and the compressor will shut itself off on its internal overload. If nothing runs at all, the contactor, the low-voltage control wire or the disconnect is the likely suspect. If both the fan and compressor run but the air inside is only slightly cool, the refrigerant charge or the condenser coil is the next place to look.

Refrigerant is not consumed as the system runs. A low charge means there is a leak, commonly at a brazed joint, a service valve or the evaporator coil. Adding refrigerant without finding the leak only delays the next call. A condenser coil packed with grass clippings, cottonwood fluff or dirt has the same symptom from the other direction: the unit cannot reject heat, head pressure rises and cooling falls off on the hottest afternoons.

Along this part of the Lake Ontario shore, the lake keeps summers cooler than they would otherwise be, so many systems sit unused for long stretches. A weak capacitor or a slow leak often goes unnoticed until the first properly hot day.

As warm air crosses the evaporator coil above the furnace, moisture condenses and drains to a pan, a trap and a line to the floor drain or a condensate pump. Water on the basement floor usually means that path is blocked by algae or debris, the pump float has stuck, or the pan is cracked.

In Grimsby's west end, around the Winston Road Neighbourhood and the newer streets near the Casablanca Road interchange, most homes have high-efficiency condensing furnaces. There the air conditioner's drain often shares a trap, a line or a pump with the furnace's own condensate. One blockage can stop both appliances, and a condensing furnace with a full trap will trip its pressure switch and refuse to run.

Ice on the copper line or the coil is another source of water. When it melts, it overflows the pan. Ice forms when the coil runs too cold, either because the charge is low or because too little air crosses it. A clogged filter is the simple cause. In the post-war houses of the Lakemount Terrace Subdivision, ductwork sized for the original furnaces and weak return air are common, and a coil starved of air will ice up on a humid day even with a correct charge.

A system that starts and stops every few minutes may be tripping its high-pressure switch because the condenser coil is dirty, or its low-pressure switch because the charge is low. It may also be oversized for the house, or the thermostat may be sitting in a draught or in sun.

Noises narrow things down further. A loud buzz at the outdoor unit is often the contactor or a capacitor. A rattle can be a loose panel or a fan blade striking debris. A screech is usually a dry motor bearing, and a steady hiss near the coil or line set can be refrigerant escaping.

The visit starts with the symptom as you describe it. The technician then measures the temperature drop across the indoor coil, the voltage at the contactor and the amperage drawn by the compressor and fan. Capacitors are tested against their rated microfarads, since a capacitor can look intact and still be weak. With gauges on the service valves and a temperature probe on the lines, superheat and subcooling show whether the charge is correct for the conditions that day. Static pressure in the ductwork shows whether airflow is the real problem. Where a leak is suspected, an electronic detector or bubble solution is used to find it.

You are shown what was found and given a written price for the repair before any part is fitted. The aim is to get the system cooling again within the same season. If the fault is a failed compressor or a leaking coil on an older unit, you also get the price of a replacement, so you can compare the two.

Refrigeration and air conditioning work in Ontario is a compulsory trade, and on this service work is performed by 313A refrigeration and air conditioning mechanics. Where the fault is on the gas side of the furnace that shares the cabinet, work is performed by TSSA-certified gas technicians.

Some homes are better served by a different system than by another repair. The cottages of Grimsby Beach and the older houses along Main Street often have little room for ductwork, and ductless units or a heat pump can cool them without opening walls. A yearly furnace and AC maintenance visit catches weak capacitors, dirty coils and blocked drains before the first hot week.