What Does This Error Mean?

Chromagen solar controller not working is usually caused by a power supply issue — the controller runs on 240V AC and will go blank if its power is cut. Check the dedicated circuit breaker for the solar controller and reset it if it has tripped.

Affected Models

Chromagen STD-C controller
Chromagen TS controller
Chromagen Soltherm DTC series
All Chromagen electronic solar controllers

Common Causes

Controller power circuit breaker tripped — the controller has its own breaker in the switchboard
Controller fuse blown — internal fuse protects against voltage spikes
Temperature sensor (collector or tank) has failed or disconnected — controller shows error or goes into fault mode
Controller internal failure from a power surge
Wiring connection loose at the controller terminal block

How to Fix It

Check the controller circuit breaker.

Go to your home's main switchboard and look for a breaker labeled Solar Controller, Hot Water Controller, or similar. If it is tripped (in the middle or off position), reset it by switching it fully off then fully on. If it trips again immediately, there is a wiring fault — contact an electrician before resetting again.
Check the controller's display for error codes.

If the display is on but showing an error code (E1, E2, sensor fault, etc.), refer to the Chromagen controller manual for the specific code meaning. Sensor error codes (e.g., 'S1 FAULT' or 'TS ERROR') usually mean a temperature probe has failed or disconnected — the controller is working but cannot read temperatures. The E1–E4 error pages on this site cover the most common Chromagen error codes.
Inspect sensor wiring connections.

The Chromagen controller receives signals from two temperature sensors: one on the solar collector and one on the storage tank. Locate the controller wiring terminals (accessible from the front panel) and check that all sensor wires are firmly seated. A loose sensor wire can cause the display to show incorrect temperature readings or put the controller into a fault lockout.
Power cycle the controller.

Switch the controller circuit breaker off, wait 30 seconds, then switch it back on. A brief power cycle clears any temporary software faults that can cause the controller to freeze or display incorrect readings. After power cycling, confirm the display shows the collector and tank temperatures updating in real time.
Replace the controller if the display remains blank.

If the breaker is on, all wiring is connected, and the display is still blank, the controller's internal power supply or logic board has failed. Chromagen controllers are replaceable units — contact a Chromagen-authorised service agent for a compatible replacement. Do not attempt to replace the controller yourself unless you are a licensed electrician — it involves 240V AC wiring.

When to Call a Professional

If the controller circuit breaker is on and the display is still blank, the controller unit itself has likely failed. Chromagen controllers must be replaced by a licensed electrician or solar technician — they are low-voltage safety devices.