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Pressure too high after bleeding rads?
We have a hot water boiler with original metal expansion tank and cast iron rads.
The fill valve was set at 15pSI. Normally system runs at 15 cold and 20-23 hot.
I noticed that two upstairs rads were not heating all the way across so i bled them and had air come out of 2.
Started up system and running hot it is approaching 30 and the limit for the pressure valve.
What might cause that? Did bleeding the rads cause the old tank to get waterlogged and raised the pressure? If I drain the tank to repressure will that help?