Marey heater cycles on and off rapidly when a small amount of hot water is used (e.g., handwashing).

Safety first: No internal work required initially.

Steps:

• Increase flow: Open the hot tap more fully to maintain steady flow above the minimum required by the Marey unit.
• Adjust faucet use: Avoid tiny trickles of hot water; instead, run a moderate flow for a shorter time.
• Remove flow restrictors: Temporarily remove low-flow aerators to test if cycling improves.
• Service flow sensor: If cycling persists at normal flows, have the flow sensor cleaned or replaced.

When to call a technician: If the unit short cycles even at high flow, indicating sensor or control issues.