anyone noticed that heater have internal thermostat that switches them off, while the

[hfp75]

Do a test and in the controller lower & raise your on/off temps.... Then watch your on times...... If one is not on as much maybe the thermostat inside isn't letting it turn on...

I had a prob where my one heaters temp was set to low and even though the controller had turned it on, it was turning itself off... Internal thermostat issue. My prob was solved by turning up the temp more....

You might have a dead heater...