Lucas Firmin Blog

Baton Rouge Hot Tubs: Top Reasons Your Hot Tub Heater is Not Heating

Posted by Lucas Firmin on Jan 28, 2019 10:35:00 AM

Baton Rouge Hot Tubs: Top Reasons your Hot Tub Heater is Not HeatingHaving a spa in your backyard is a great way to relax and unwind.  Whether it’s after a long day at the office, or you’re rehabbing some sore muscles, your hot tub is a welcome retreat.  It really only has one job, and it’s right there in its name; be hot.  Now during a hot south Louisiana summer, it needs little help to accomplish this goal, but during the cool fall and spring months, not to mention our brief, yet cold winter, your hot tub’s heater will be providing the heat.  So what happens when you turn on your hot tub, but your hot tub’s heater doesn’t turn on?  Here are few of the common reasons that your spa isn’t heating.

Check Your Hot Tub’s Thermostat

Just like inside your home, the temperature of the water in your hot tub is regulated by a thermostat.  If the water is heating, or reaching your desired temperature, check your thermostat’s setting.  If everything looks fine you can investigate further by inspecting the cord and probe for damage.

What is “Low Flow”?

A dirty filter can create “low flow” in your spa or hot tub.  If you notice it isn’t heating as it should, remove and clean the filter to ensure that pressure and flow rate aren’t the issue.  Flow issues can also be caused by a block spa drain, clogged pipes, closed valves, a clogged pump impeller, or simply low water level. 

Check Your Hot Tub’s High Limit Switch

The high limit switch in your hot tub is similar to the pressure switch.  This component is a part of the safety circuit.  It is designed to prevent the heater from overheating.  These switches are calibrated to shutoff at a predetermined maximum temperature.  When this temperature is reached, the switch will open, breaking the circuit that powers the heater.   Low water flow, incorrect voltage, and loose wire connections can all be causes for a high limit switch to malfunction; preventing the hot tub from properly heating.

Hot Tub Wires, Fuses, and Breakers 

Like with any machine that runs on electricity, the components that complete and power the circuits generating the power need to be intact and functioning.  While these problems can be frustrating, they can also be simple to fix.  Make sure that all connections are tight and not oxidized.  Check for blown fuses.  Check you GFCI to see if it is tripped.

Dirty Hot Tub Heating Elements

The heat that makes your hot tub hot is generated by its heating element.  These elements are susceptible to scale buildup, shorts, and can burn out quickly if not surrounded by cooling water.  Scale buildup can reduce its heat output.  You can also use a test meter to measure the ohms that the element is producing.  9-12 ohms is good output for your heating element.

Lucas Firmin Pools builds, maintains, and services custom pools, hot tubs, and spas in the Baton Rouge area. If your hot tub isn’t heating, or its time to update or upgrade your pool or spa, the expert team at Lucas Firmin Pools is here to help.

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Topics: Spa