Convotherm E27

What does Convotherm E27 mean?

E27 indicates excess temperature of the steam generator heater. The manual attributes this to the steam generator being dirtied, and lists the remedy as descaling the steam generator. Scale and dirt build-up on the heater make it run hotter than designed, so the control trips E27 to protect the heating element until the unit is cleaned.

Symptoms

• Display shows error code E27
• Steam generator heater running too hot
• Reduced steam performance from scale build-up

Common causes

• Steam generator dirtied with scale or residue

Diagnostic steps

1. 01

   Descale the steam generator

   The manual's remedy for E27 is to descale the steam generator to remove the build-up causing the heater to overheat.

2. 02

   Use the correct descaling agent

   The manual specifies using only Cleveland Range Dissolve for descaling the steam generator.

3. 03

   Allow the unit to cool first

   Let the steam generator cool before descaling to work safely and effectively.

4. 04

   Restart and monitor

   After descaling, restart the combi and confirm E27 does not return during steam operation.

When to call a professional

Descaling is normal maintenance, but if E27 returns after a proper descale with the specified agent, the steam generator heater may need inspection beyond cleaning. In that case contact a qualified Convotherm by Cleveland authorized service representative, especially where heavy scale, water-quality problems, or a suspected heater fault are involved.