When the pool’s heater malfunctions, the source of the problem could be more complex than working with pumps or filters. For example, if the heater doesn’t turn on, it could be a sign of low pressure caused by a dirty filter. However, it could also be an issue with the electrical connections. If this is the case, you will need the assistance of a professional.
If your heater is making loud noises, check your system hoses and filters for blockages. An excessively noisy heater could also be an indication that it is in action after the pump has been shut off, which suggests there is a faulty pressure switch in need of repair. If you can’t find the noise’s source, switch off the power and contact a technician.