In Glendale, many pool owners first notice a heater problem on the first warm weekend of spring, when they switch it on after months of rest and nothing happens. Because so many heaters get turned back on at the same time, late winter and early spring is the best time to find and fix problems before you want warm water.
Here are the most common reasons a pool heater will not work, and what you can safely check yourself.
Low Water Flow
Pool heaters have a pressure switch that keeps them from firing unless enough water is moving through them. A dirty filter, a full skimmer or pump basket, a partly closed valve, or a pump running at a low speed can all keep the heater off. Before anything else, clean the baskets, check the filter pressure, and confirm the pump is running.
Thermostat and Mode Settings
It sounds simple, but settings cause many no heat calls. Make sure the heater is set to pool or spa mode as intended, the temperature is set above the current water temperature, and any automation system is calling for heat. Timers can also turn the pump off before the heater has a chance to run.
Error Codes on the Display
Most modern heaters show an error code when something is wrong. Write down the code before resetting anything, since it points to the part of the system that needs attention, such as flow, ignition, sensors, or high temperature limits.
Ignition and Gas Supply Problems
On gas heaters, clicking without lighting can mean an ignition problem or an issue with the gas supply. These repairs involve gas and electrical components and should be handled by someone experienced with pool heaters.
Scale From Hard Water
The City of Glendale describes its water as very hard. Inside a heater, hot water causes calcium to deposit on the heat exchanger. Over time, scale reduces heating efficiency and can lead to overheating, error codes, or leaks. Keeping calcium and pH balanced with regular pool chemical balancing protects the heater.
Quick Spring Heater Checklist
- Clean the skimmer and pump baskets and the filter.
- Confirm the pump runs and valves are set for pool or spa.
- Check the thermostat setting and mode.
- Look for error codes and write them down.
- Clear leaves and debris from around and on top of the heater.
- Look for water leaking from the cabinet or connections.
Get Your Heater Ready for the Season
If your heater still will not run after these checks, our pool heater repair service can find the cause. Flow problems are often linked to the filter, so see pool filter cleaning as well. To control the heater from your phone, ask about pool automation installation. Contact Glendale Pool Service to schedule a visit.