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Water too cold

Water at the tap is too cold — Hot water supply issue

Daikin · Altherma 3 HF

What does Water too cold mean?

The hot water is not as hot as expected. This can happen if the hot water tank has been depleted due to high usage, or if the tank temperature is set too low.

Common Causes

  • Unusual high consumption leading to depleted hot water
  • Desired DHW tank temperature is set too low

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    If hot water is needed immediately, activate the DHW tank 'Powerful operation' (note this uses extra energy).

  2. 2

    If the problem occurs daily, increase the DHW tank temperature preset value.

  3. 3

    Adjust the DHW tank temperature schedule to allow for more frequent heating.

  4. 4

    Ensure the 'Eco setpoint' for DHW is not set too low during heating periods.

Browse all codes in this manual (7)
Verified technical data. Last updated: April 2026

Related Faults

Blinking redBlinking red LED — Malfunction occurredErrorError message on screen — Malfunction detectedGurgling noisesGurgling noises after commissioning — Air in system
Source: Daikin Altherma 3 HF
Open Manual (Page 15)Search more codes in this manual