Do you actually come out to Moraga, or is that too far from San Ramon?

Moraga is a regular stop for us. San Ramon to Moraga is around 20 minutes via Crow Canyon and Bollinger Canyon roads, so it is well within our normal service area. We schedule Moraga calls the same way we schedule anything else in the Diablo Valley, no surcharge, no "we'll try to fit you in" runaround.

Is GrandAire equipment worth repairing, or should I just replace it?

Depends on the situation. For a rental or an ADU in Moraga where you need reliable and cheap, a GrandAire repair almost always makes sense because the parts cost is low and the platform is solid Carrier underneath. For an owner-occupied home where the unit is more than 12-15 years old and showing multiple component failures, a conversation about replacement is fair. We will tell you honestly which way it looks at diagnosis, not push you toward a new unit if a $150 repair gets you several more years.

What does the $75 diagnostic actually cover, and what warranty do I get on the repair?

The $75 covers a full diagnostic: reading board fault codes, testing components, and identifying the exact failure. If you decide to move forward with the repair, that $75 comes off the bill entirely. We give you a written quote with the specific cost before we touch anything. Every repair we complete carries a one-year warranty on both parts and labor.

GRANDAIRE · MORAGA

Service · All GrandAire Models

GrandAire Heat Pump, AC & Furnace Repair · Moraga, CA

GrandAire heat pump, AC, and furnace repair in Moraga, where the canyon heat pushes budget equipment harder than anyone expects.

$75 diagnostic (waived with repair)
Same or next-day best effort
CSLB #1136642

Call (925) 999-4095

GrandAire in Moraga

GrandAire heating and cooling in Moraga.

Moraga sits in a bowl between the Las Trampas and Oakland hills, and that geography bakes it. Summer afternoons routinely hit the 90s on Moraga Road when the coast is fogged in, and the housing stock is mostly mid-century ranch and split-level homes built in the 1950s through 1970s, nearly all with ducted forced-air systems. GrandAire equipment shows up frequently here, mostly in rentals, flip rehabs, and owner-occupied homes where someone replaced a failed unit on a tight budget. It is straightforward Carrier-platform hardware, single-stage, no communicating controls, and it does its job until a cheap component gives out.

When a GrandAire furnace or condenser comes in for diagnosis, we start with the board fault codes and the wiring, not parts. On furnaces, the igniter and flame sensor are the first things to check because GrandAire does not use premium igniter stock, and in the Moraga climate where systems sit idle all spring, the ceramic igniters crack and the flame sensors oxidize quickly. For condensers, we check the run capacitor and contactor before anything else, especially after the first real heat wave of the season when a unit has been sitting since October. We pull the data, confirm the fault, then quote.

Bay Area HVAC Service is our HVAC division, based out of San Ramon, which puts Moraga about 20 minutes away. The diagnostic fee is $75, and that charge disappears if you authorize the repair. Before any work starts, you get a written quote with the exact cost. We carry EPA Section 608 Universal certification and operate under CSLB license 1136642. Repairs come with a one-year warranty on parts and labor.

Common repairs we do

What we close on the truck.

Cracked Igniter, No Heat. The symptom is a furnace that induces, tries to light, and then locks out, often flashing a fault code 3 or 4 on the board. GrandAire uses a standard silicon nitride igniter, and in units that sit unused through Moraga's mild spring and cool summer nights, the ceramic cracks from thermal stress when heat season starts. We confirm the crack visually and with a resistance check, swap the igniter, and verify full light-off sequence before we leave. Parts are common Carrier-family stock, so same or next-day turnaround is the norm.
Flame Sensor Fouling, Short-Cycling Burner. A fouled flame sensor causes the burner to light and then cut out within a few seconds, repeating two or three times before the board locks out. The control board reads no flame signal even though the burner is firing because oxidation on the sensor rod kills conductivity. We clean the rod with fine steel wool, re-fire the sequence, and measure microamp signal to confirm it is within spec. If the rod is pitted badly enough that cleaning does not hold, replacement is inexpensive and done the same visit.
Failed Run Capacitor or Burned Contactor, No Cooling. In a Moraga summer when temperatures sit in the mid-90s for days, the run capacitor in a GrandAire condenser takes sustained thermal load and fails, leaving the compressor humming but not starting, or the fan spinning weakly. The contactor is the other common failure, its contacts burning after repeated cycling in high heat. Both are straightforward repairs: we test capacitance and contactor pull-in, confirm no secondary damage to the compressor windings, and replace what has failed. Most of these calls are same or next-day parts and same or next-day repair.

Models we service

GrandAire product lines.

Gas furnaces (value single-stage)
Heat pumps and AC condensers
Air handlers and coils
Builder and supply-house equipment
Diagnostics, board and igniter repair, warranty work

Pricing and warranty

What it costs. What we stand behind.

$75

Diagnostic visit. Waived when you book the repair with us.
Written

90 days on consumables, 1 year on major parts, 2 years on sealed-system rebuilds. Quoted in writing before work starts.
CSLB

#1136642. Bonded and insured. We file warranty paperwork when applicable.

Nearby cities

GrandAire service in neighboring cities.

FAQ

GrandAire in Moraga questions, answered.

Do you actually come out to Moraga, or is that too far from San Ramon?

Moraga is a regular stop for us. San Ramon to Moraga is around 20 minutes via Crow Canyon and Bollinger Canyon roads, so it is well within our normal service area. We schedule Moraga calls the same way we schedule anything else in the Diablo Valley, no surcharge, no "we'll try to fit you in" runaround.
Is GrandAire equipment worth repairing, or should I just replace it?

Depends on the situation. For a rental or an ADU in Moraga where you need reliable and cheap, a GrandAire repair almost always makes sense because the parts cost is low and the platform is solid Carrier underneath. For an owner-occupied home where the unit is more than 12-15 years old and showing multiple component failures, a conversation about replacement is fair. We will tell you honestly which way it looks at diagnosis, not push you toward a new unit if a $150 repair gets you several more years.
What does the $75 diagnostic actually cover, and what warranty do I get on the repair?

The $75 covers a full diagnostic: reading board fault codes, testing components, and identifying the exact failure. If you decide to move forward with the repair, that $75 comes off the bill entirely. We give you a written quote with the specific cost before we touch anything. Every repair we complete carries a one-year warranty on both parts and labor.

Need GrandAire service in Moraga?

Tell us what is broken. We will quote it.