Pool Heater Not Working in Las Vegas: Gas and Heat Pump Problems

Updated 2026-11-05 · For Las Vegas pool owners

Most pool heaters in Las Vegas spend nine months asleep and then get asked to fire the spa on a 45 degree November night. That is when they fail. The usual causes are small and specific to the kind of heater you have, and the repair versus replace decision depends on the heater's age more than the fault. Here is how to narrow it down before a technician comes out.

What it usually means

Clicks but no flame (gas): igniter or flame sensor. On older heaters a dirty pilot assembly. The most common repair.
Will not start, display shows a flow or pressure code: the pressure switch is not seeing enough water. Dirty filter, low pump speed, or a closed valve. On a variable-speed pump the heater needs a high enough speed to satisfy the switch; a schedule change can break heating.
Fires, runs a few minutes, shuts off: high limit tripping from low flow or scale inside the heat exchanger. Las Vegas calcium scales heat exchangers faster than almost anywhere.
Error code on a heat pump (LP, HP, FLO, defrost): low refrigerant, blocked airflow, low water flow, or outside air too cold for the unit to work.
Rust streaks and water under the heater: a leaking heat exchanger. On a heater over 8 years old that is usually a replacement, not a repair.
Nothing at all: breaker, gas valve turned off at the meter after other work, or a failed control board.

What a technician will check

Gas: incoming gas pressure, igniter and sensor, pressure switch, high limit, thermistor, the control board, and the condition of the heat exchanger and burner tray. Heat pump: refrigerant pressures, the fan and coil, water flow, and the control board. Either way they will check filter pressure first, because a loaded filter is the cheapest reason a heater refuses to run. Ask for the heater's model and year; it decides everything about the quote.

What it costs in Las Vegas

Service	Las Vegas range
Diagnostic visit	$100 to $200, often credited to the repair
Igniter, flame sensor, pressure switch, thermistor	$150 to $450
Control board	$400 to $900
Heat exchanger descale or replacement	$500 to $1,500
New gas heater (400,000 BTU typical here), installed	$3,500 to $6,000
New heat pump, installed	$2,500 to $7,000

These are Las Vegas ranges to judge a quote by, not a quote. Nationally a heater repair averages around $470, with a range from under $100 to over $2,500, and replacements average around $3,000. Installed prices swing on whether the gas line or the 240 volt circuit has to be upgraded, which is the usual surprise. The repair versus replace rule most local techs use: if the heater is over 8 to 10 years old and the repair is more than a third of a new unit, replace it.

Why most Las Vegas pools do not heat all winter

Heating a full pool from December to February in Las Vegas means fighting 40 degree nights and dry air that pulls heat off the surface. On gas that runs $200 to $400 a month or more, and heat pumps lose output below about 50 degrees, which is most winter nights here. So the typical valley setup heats the spa only, or heats the pool for a weekend and lets it drop. A heater that is asked to do only that lasts longer and costs less to fix, and a solar cover does more for the water temperature than a bigger heater.

When to call

Check the filter pressure, the pump speed, and the breaker yourself. If the heater has a code, write it down and give it to the company when you call; it shortens the visit. Call before November if you want the spa working for the holidays, since heater calls stack up on the first cold week. Gas work and refrigerant work are not DIY jobs; a Nevada licensed contractor should do both.

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