Have an Altherma SpaceAir heating/hot water system. Just tried the central heating for the first time in months, but the radiators do not heat up, no matter how high I make the temperature.
Compressor and heat pump both turn on when the heating is switched on, however no hot water reaches the radiators. The sanitary hot water tank works fine, so I know the boiler (heat-pump) is working.
Had a look at the unit in the loft - the pipe that runs from the Actuator (Siemens DVA3) to the hot water tank is warm to touch, however the pipe that feeds the radiators is only warm next to the actuator, then become cold after about 10cm. Switching the actuator from Auto to Manual does nothing.
Any suggestions what I need to do/replace would be much appreciated.
Compressor and heat pump both turn on when the heating is switched on, however no hot water reaches the radiators. The sanitary hot water tank works fine, so I know the boiler (heat-pump) is working.
Had a look at the unit in the loft - the pipe that runs from the Actuator (Siemens DVA3) to the hot water tank is warm to touch, however the pipe that feeds the radiators is only warm next to the actuator, then become cold after about 10cm. Switching the actuator from Auto to Manual does nothing.
Any suggestions what I need to do/replace would be much appreciated.