Equipment repair
Pool Heater Repair in Los Angeles
Won’t fire, fires and quits, or shows a code you cannot clear. Most heater faults are a sensor, a pressure switch or gas supply — not a new heater.
The short answer. A gas heater that will not fire is nearly always stopped by one of three things: too little water flowing through it, a fault in the ignition or gas train, or a safety switch doing its job. The first you can often spot yourself. The other two are a technician's job.
If you smell gas at the pad, do not investigate. Leave, and call the gas utility from somewhere else.
Why it always happens in October
Los Angeles heaters do not fail in winter. They fail the week you switch them on
Nobody heats a pool here in August. The heater sits off through September, then the first cool week arrives, half the city reaches for the same switch on the same evening, and finds out what stopped working in May.
The wave lands when every pool company in the county is already booked. A heater idle for four months is not proven working — it is untested. Run it for a full cycle on a warm afternoon in September, and a failure becomes ordinary work instead of a place in a queue.
Start with what yours is doing
- Nothing at all
Power, a breaker, or a control holding it off.
- Fires, then quits
Short cycling — almost always flow, or a high-limit switch.
- An error code
The unit is naming its fault. Photograph it before clearing.
- Runs, never reaches temperature
Scale, a stuck bypass, or an undersized heater.
- Water under the cabinet
A union, or the heat exchanger — very different conversations.
- Rust or a scorched smell
Stop using it. Not a wait-and-see.
Four things worth checking before you call anyone
None involve opening the heater or touching a gas line. They are the first checks a technician makes, and often one is the whole problem.
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Is the pump running, and the filter clean?
A heater will not light without adequate flow — an interlock, not a fault. If the pressure gauge reads well above where it sits after a clean, the filter is due. The most common cause of all. Filter cleaning.
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Are the valves where they normally are?
Most pads have a valve routing water through the heater or around it. Left on bypass over the summer, it runs on almost no water. Unsure which is which? Leave them alone and say so.
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Do your other gas appliances behave normally?
The heater is usually the largest gas draw on the property. A weak stove flame, or a gas appliance added recently, can mean it is starved of pressure. Collect evidence; adjust nothing.
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What does the controller say?
It stays off if the set point is below water temperature, if the system is in spa mode, or if a schedule locked it out. On an automated pad the fault is often not the heater. Automation repair.
Where the checking stops. Clearing a code once is reasonable. Resetting a heater that keeps tripping is not — the switch trips for a reason, and overriding it turns a small repair into a replacement.
The most common causes, roughly in order
Ranked by how often they turn out to be the answer on a Los Angeles pad.
- Restricted water flow
Dirty filter, full baskets, a bypassed valve, a tired impeller, a skimmer drawing air.
- Ignition faults
Igniter, flame sensor or gas valve. It tries but never catches, or drops out after seconds.
- Scale in the heat exchanger
The Los Angeles fault. Hard water insulates the tubes: gas burns, water barely warms.
- A tripped high-limit switch
Usually a symptom of the flow problem above, which is why replacing the switch alone fails twice.
- Gas supply and pressure
An undersized line, an ageing regulator, or an appliance added since the pool was built.
- Corroded or cracked heat exchanger
Years of low pH eating copper. On an older heater this ends it.
- Rodents in the cabinet
Common in the Foothills. What moves into a dark dry box chews the wiring.
- The controller, not the heater
A failed actuator, a lost schedule, a dead relay.
How we diagnose one
The water side first — flow, filter pressure, baskets, valves, level — because a starved heater has no internal fault yet. Then the unit: codes, fault history, controller state. Then gas, ignition and exchanger, in the order that isolates the fault rather than the order that replaces the cheapest part.
You get the answer with the reasoning attached: the part, the labour, and what else on the unit is close to going.
Repair, or replace?
We repair before replacing wherever the part can be saved, as on everything else on the pad. Four cases where replacing is the honest answer:
A failed heat exchanger, which approaches the price of a new heater and is not worth making on a ten-year-old unit. Faults stacking on an ageing heater — two repairs in a season is a pattern, not bad luck. Parts gone scarce on a discontinued model. And a heater that was always too small, which no repair fixes.
HomeAdvisor publishes an average near $3,000 to replace a pool heater and $100–$200 a year to maintain one. Market figures, not ours — we quote after seeing the pad. How we price work.
How long a gas heater should last
Seven to twelve years is the commonly cited range, and Los Angeles pushes both ways at once: no freeze damage in our favour, but hard water scales the exchanger fast and a season of low pH eats copper.
Which is the unglamorous case for weekly service: calcium hardness, pH and alkalinity are checked every visit, and so is the heater. Scale caught as a rising number is a chemistry adjustment; scale caught as a heater that no longer heats is a heat exchanger. When replacement is the answer we install what we know inside — the Jandy JXiQ and Pentair MasterTemp.
Spas fail differently from pools
Pool heating is a slow lift over hours. Spa heating is a fast lift to a much higher set point, on demand — the same heater cycles harder, runs hotter and scales faster.
A heater that still warms the pool but struggles with the spa is usually showing early scale or flow trouble, not a spa fault. On a shared pad, an actuator that no longer rotates fully leaves the spa half-fed while the heater takes the blame.
We service heaters on pools, spas and combined systems, alongside pumps, filters, salt generators, lights and automation controls.
Questions people ask about pool heater repair
How much does it cost to fix a pool heater?
It depends almost entirely on which part failed. A heater locked out by a dirty filter costs a filter clean and nothing else. Ignition-side parts are real parts-and-labour repairs. A heat exchanger approaches the price of a new unit — HomeAdvisor publishes about $3,000 as an average replacement.
Can an electrician fix a pool heater?
Only the electrical part. A gas heater puts a gas train, a pressurised water circuit and low-voltage controls in one cabinet, and most failures involve two of the three. An electrician can address the circuit, breaker and wiring — occasionally the whole fault. A gas valve or a scaled exchanger is not.
What is the life expectancy of a pool heater?
Roughly seven to twelve years, with water chemistry the biggest variable. Hard water scales the exchanger faster here than in most of the country, and a season of low pH shortens a heater's life measurably.
How do I reset my pool heater?
Most units reset by switching off at the heater, then at the breaker, waiting a minute and restoring power. Once is reasonable; repeatedly is not. A heater that trips again is reporting a real fault, usually a flow restriction or an overheat. Photograph the code first.
My heater is on but no heat is coming out. Why?
Three explanations. Water is moving but too slowly to let it light — check filter pressure, baskets and valves. Or it lights but the heat never reaches the water, which points at scale on the exchanger tubes. Or it is warming, just slower than you expect.
How quickly can you look at a heater in October?
October is the busiest heater month in Los Angeles: the whole city switches on within about two weeks. Members on weekly service get priority scheduling, which in that fortnight is what the membership actually buys.
Next step
Tell us the symptom and the code
Pool Care LA is a family-owned company in Studio City, servicing pools and spas across the Foothill communities and the neighbourhoods around them. Send the make, what it does when you switch it on, and anything on the display — usually enough to tell a filter clean from a heat exchanger.
On weekly service the heater is inspected every visit. Members get 20% off individual services and priority scheduling — which matters most in the month everyone else's heater fails too.