Worcester Greenstar 30CDi

29 Sep 2013
Reaction score
United Kingdom
We have two issues. I suspect that they are not actually problems – the heating work fine.

Worcester Greenstar CDi. Installed in unheated garage. Protected by Honeywell pipestat and froststat.

1. The garage was cold (approx. 7° C). The room thermostat had demanded heating and the house had reached the set point (15°C) and the thermostat opened. The thermostat was turned up to 19°C. The boiler and pump switched on. The temperature on the display fell as the cooler water in the radiators was pumped back into the boiler. At 28°C the boiler switched off for 30 seconds (green ignition light went off, pump and boiler fan still running) and then flared on again and heated the water up to 64°C At all times, the roomstat was closed, demanding heating.

2. The garage was cold (approx. 7° C). There was no demand from the room thermostat or Hot water. The boiler temperature was approx. 60°C. The boiler ignited (green light on) for 30 seconds and the fan in the boiler ran for two minutes. It then switched off.

The heating does what is meant to – keep the house warm, but do was have an underlying problem? There was no faults shown on the boiler display and I cannot envisage any scenario that explains these actions. Please can anyone throw any light on it?
Sponsored Links

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local