---
title: Malfunctions in Flow Heating Units
description: Diagnose and resolve common Flow Heating Unit malfunctions including no function and no heating. Find causes, remedies, and when to contact Craster support.
---

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# Malfunctions in Flow Heating Units

## The most common malfunctions encountered with Craster Flow Heating Units, their likely causes, and the recommended remedial actions to restore safe and effective operation.

#### **Common Malfunctions and Remedies**

#### The following table outlines the primary malfunctions that may occur, their likely causes, and the appropriate corrective steps:

| **Problem** | **Likely Cause** | **Recommended Remedy** |
| --- | --- | --- |
| **No Function** | - Mains plug not inserted correctly - Electricity supply fuse has blown | - Pull out the plug and reinsert it correctly - Check the fuse and test the device at an alternative outlet |
| **No Heating** | - Power supply interrupted - Heating element is defective - Temperature controller is defective | - Check the power supply - Contact the seller or Craster customer service |

#### **Important Safety Guidance**

#### The malfunctions listed above are provided for guidance and should be regarded as illustrative examples. Should any of these or similar problems occur, the following steps must be taken immediately:

1. #### **Switch off the device immediately** and discontinue use.
2. #### **Contact a qualified specialist or Craster directly** — do not attempt to carry out repairs independently.
3. #### Be aware that **maintenance and repair work may only be performed by qualified professionals** using original spare parts and accessories.

#### **Mains Cable and Power Supply Checks**

#### As part of routine operational vigilance, inspect the mains cable periodically for signs of damage. **Do not use the device if the cable is damaged.** A damaged cable must be replaced by customer service or a qualified electrician to eliminate safety risks. Should the power supply be interrupted, note that the residual heat indicator will cease to flash even if the combination plate remains hot above 40 °C — exercise caution and do not touch the plate or place heat-sensitive objects on it until it has returned to ambient temperature.

 

#### **Residual Heat Indicator Behaviour**

#### The residual heat indicator is designed to alert operators when the combination plate remains hot after the heating element has been switched off. The temperature display will continue to flash for as long as the plate temperature exceeds 40 °C. However, if power is interrupted, this flashing signal will disappear even if the plate is still hot. Staff should always treat the combination plate as potentially hot until it has visibly cooled and returned to ambient temperature.

 

**When to Contact Craster Customer Service**

In the event of damage, persistent malfunction, or any situation not resolved by the basic checks outlined above, contact Craster customer experience team, email: info@craster.com. 

**Do not attempt self-repair.** Parameter adjustments to the control settings should only be carried out by customer service.

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