Profitec Pro 700: Heating Issues

by Whole Latte Love 4 min read Updated: November 12, 2025

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If your Profitec Pro 700 isn’t heating or is displaying the A1 or A3 PID messages, start with simple checks (power and water reservoir detection), then move to sensor and wiring inspections, and finally test safety thermostats, heating elements, relays, and the control board. This guide walks you through safe, step-by-step diagnostics to pinpoint whether the issue is the reservoir sensor/float magnet, a tripped high-limit thermostat, a loose or failed temperature probe (NTC), a failed heating element, a worn relay, or—less commonly—the control board or PID power supply.