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Hot water is fine but space heating doesn't work
I am using VITODENS 100-W as heating system for both domestic hot water and space heating ( through floor) . Now the hot water is fine but the space heating doesn't work. I have this problem for about 2 months. There is not any fault showing in the indicator. I tried reset the machine but it still doesn't work. I know it may be circulation pipe problem since the pipe is quite old, but I don't know how to further diagnose this issue. For example, how to tell if the thermostat is working fine? if it's a pipe problem, how to tell how bad it is？