Your heat pump is going through a defrost cycle.
165
vent door will be open to what ever setting u set it on regardless of what temperature setting you are using
110-120 degrees Fahrenheit.
Have you turned the control from Pilot to On? Have you increased the temperature setting?
In general it depends solely on the temp setting on your hot water heater.
This is difficult to answer coz it depends on the power of your heater and original temperature of the water. Say a 1000W heater, might be tens of seconds, if the water was at room temperature.
low on anti freeze or blockage in heater coil
with your hands, jk but on my car you usally hold down the button that shows the outside temperature
Thermostat setting may be same as room temperature ,therefore boiler will not ignite
If it is broken. It could be a faulty temperature blend door actuator.
"Pilot" is only when initially igniting your water heater. Some manufacturers state to leave it on "Pilot" for so many minutes before turning to on but this is only temporary. It should be then turned to "On" and then if you have a low, medium or high setting or degrees adjustment, adjust the temperature setting. Remember that most local plumbing codes and water heater manufacturers recommend a temperature of no more than 120 degrees F.
The temperature blend door may be at fault.