---
title: My radiators are cold
description: Troubleshoot cold radiators by checking ZEB status
---

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September 14, 2026

# My radiators are cold

## Troubleshoot cold radiators by checking ZEB status

## Why are my radiators cold when I expect heating?

Cold radiators during an expected heating period are usually caused by the ZEB not discharging, a thermostat or programmer not calling for heat, or closed thermostatic radiator valves (TRVs). Work through the steps below in order to identify and resolve the issue.

1. Check whether the ZEB is discharging heat by looking at the **Comms Box** (the **Discharging** LED should be illuminated) or the tepeo App **Home** screen (the **ZEB Status** should show **Discharging**).
2. Ensure your thermostat is turned up and your programmer is set to call for heat.
3. If your radiators have thermostatic radiator valves (TRVs), make sure they are fully open.

If the **Discharging** LED is on and the issue persists, carry out the following checks if you are confident doing so:

1. Bleed your radiators to release any trapped air.
2. Check that your central heating system pressure is within the correct range (typically between 1 and 1.5 bar when the system is cold — consult your boiler or system documentation for the recommended range for your installation).

If there is any uncertainty, please contact a qualified heating engineer or your installer before contacting tepeo.

If the problem remains, contact the tepeo Support Team via the tepeo App or at [**www.tepeo.com/contact-us**](http://www.tepeo.com/contact-us)

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