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Retest the breaker. One side can trip without moving the handle. This will stop 240 to the element but still operate everything that operates at 120 volts.
3 Bar = 43.5 PSI When you heat water it always expands increasing pressure.
In a closed vessel volume can increase by 2-3%. Either expansion tanks allow for this and PSI is maintain or without an expansion outlet the PSI will increase in proportion to heat supplied.
Is this a low temp hydronic boiler operating at or <140F, a hi temp hydronic boiler @ >180F or steam boiler?
in electric dryers,no heat is often caused by burnt-out heating elements,then overheat thermostats,and lastly operating thermostats.this assumes power and drum operation are nominal. some elements are in a "containment vessel". the really tough ones are behind the drum WITHOUT a separate enclosure. as it. is with dryers,the drum belt is best untightened by undogging it from the idler pulley.
Any engine, when cold, takes at least 3 miles before reaching operating temperature.. After reaching operating temp it still takes a mile or 8(depending on your vehicle) before "over" temperatures are reached. Therefore if needed, a vehicle can be driven several miles without any coolant/water at all before overheating and causing damage, if started from from cold.
I have installed many heat pumps and if it is installed without and ouside temperature sensor I would not recommend running it below freezing 32 degrees farenheheit. Running a heat pump at low outside ambient temps. can hurt your compressor and that is the most expensive part of the outside unit.
It is just one possibility of several as to why the dryer is not heating.
You nreally need a test meter to check the various components involved in the heating process.
Hope this is of some help to you.
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