Marley/Fahrenheat F2500 baseboard heaters are simple resistive heaters used for zoned electric heat, often controlled by a wall thermostat. Because the design is mechanically simple, the heater body can last a long time, and most "repairs" involve the thermostat, wiring connections, or safety cutoff rather than the element itself.
Repairs are usually worthwhile when they are limited to replacing a thermostat or fixing a loose splice, since parts are inexpensive. Replacement becomes more attractive when there is visible corrosion, scorching, persistent tripping, or damaged wiring insulation, because safety risk outweighs savings.
Use the threshold as a sanity check: extensive electrical troubleshooting can exceed the cost of a new heater quickly. Also confirm that airflow is unobstructed; blocked baseboards can overheat and trip limits.
If you're renovating, consider upgrading controls to improve comfort and reduce energy waste rather than replacing heater bodies that are still structurally sound.