Good news is that the problem is fixed:
>>> Could be worn out solder joints on the heater control panel.
It seems that this was exactly the problem. I resoldered all the joints on the unit (I suppose there's 30-50 of them), took about 10 mins.
Now the heating is steady and hot.
Also removing and putting back that unit has made the lights on the heater controls work - perhaps the leds were loose.
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