Miller home heater -runs but clicks off and on,off and on, during heating cycle .so far it keeps coming back on to get up to selected temp but this hickup during heating cycle, what problem does this fortell. thanks in advance. runs on kero. has programable thermostat to regulate heat timing and temp. thanks again

If it blinks 7 times, then pauses, then 7 times....over & over, then the computer control has failed to see an increase in water temperature during the last cycle. That means the heater could be out, the temperature sensor is out, the heater drive circuit is bad, there is not enough water or the water is not circulating properly. The newer models have different blink sequences that mean other things. On most models you can press hi temp wash>heated dry>hi temp wash>heated dry in quick succession to enter a service mode. All the lights will come on, then after the control clicks a few times, just press cancel & the control will be reset & you can run another cycle. If it does the same thing again at the end of the next cycle, it will need repairs.

Heaters have
)Tip over switch If the heater is thermostatically controlled then what you may have is the thermostat cycling just as a central heating system in your home. When heater reaches the temp you set it shuts off, then comes back on when temp drops several degrees below setting. Yes, It is normal. Ned
2)Thermostat

try looking at the afc the fan control might need cleaning at the back of it could be filled with dust, or blocked air filter afc works on temp rise to start fan running and temp fall to stop running check settings on the afc thhey should be in your manual or afc might need changing

the fan has to be on while the strips are on. knowing that the fan comes on when you switch it to on at the thermostat but not when your just calling for heat indicates that you have somting wrong with the heating relay or the fan isnt wired properly to the heating relay (posssibly a new motor during the summer) or just a bad relay. when the first stage heat comes on it should also energize the motor the first to come on is also the last to shut off which will make sure the fan runs during the whole heating cycle. until you remedy this you can run the heat just keep the fan switch set to on so its running, this will not hurt anything

Output switch is the one that says Cool-Off-Heat. Turn this offwhen you aren't home.
Output control is the thermostat. If you want to heat the room turn up the thermostat to the desired heat after putting the output switch on heat. It will take a few minutes for the heater to get hot. Early boost would be if you want immediate higher blower speed to speed up keep the heated air from being too hot and late boost will hold off the fan until the heater is higher in temp and the air temp discharged will be hotter.

I replaced the upper control panel, and that was the problem.

Yes. The defrost cycle of a heat pump is actually turning on your airconditioning to heat up the condenser to thaw it out. During this cycle your electric strip heaters "should" be adequate enough to compensate for the a/c being on. At about 30 - 34 degrees outdoor temp there is not enough heat in the air to to adequately heat your home with the heat pump only. Some technitions will use an outdoor thermostat to turn off the heat pump when it is under 34 degrees outside. If you are to cold when its under 34 degrees intall more electric strip heaters.. But if you do this your electric bill may go up significantly.
Welcome to the wonderful world of electric heat pumps (lol).
Good luck.

Hi sounds like the pressure switch is faluty try jumping out to see if it starts

I too had Flashing Clean light and only responded to Cancel light by trying to drain. Whirlpool Model DU1145. I too got problem to clear by pushing High temp,Heated dry, High temp and Heated dry. All lights on display lit up then it went through sequences of all cycles.