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System does not heat up instantly

System does not heat up instantly — Initial heat-up or backup heater

Panasonic · Aquarea Heat Pumps

What does System does not heat up instantly mean?

The system requires time to heat water from cold. The backup heater may automatically engage to assist.

Common Causes

  • Starting with cold water.
  • Normal system warm-up time.
  • Backup heater activating.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Allow the system adequate time to reach the set temperature.

  2. 2

    Check if the backup heater is enabled in the system settings.

  3. 3

    If heating is consistently slow, contact your installer to verify system performance.

  4. 4

    Ensure outdoor unit vents are not blocked.

Browse all codes in this manual (69)
Verified technical data. Last updated: April 2026

Related Faults

2 beeps then pause2 beeps then pause - Overfill warning3 red flashes3 red flashes - Communication errorError Code DisplayError Code Display - Abnormality detected
Source: Panasonic Aquarea Heat Pumps
Open Manual (Page 18)Search more codes in this manual