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Troubleshoot the boiler: nothing happens
The first thing to look for is power. Is there a power switch on or near the boiler? It may look like a light switch and could have been turned off inadvertently by someone thinking they are turning off a light.
Is the breaker turned on? Has it tripped? Is there a blown fuse?
If there are any indicator lights or motors running on the unit? If so, there is power available.
Is the thermostat calling for heat? If the thermostat has a system switch, it should be in the heat position. Is the thermostat set well above the temperature in the structure?
A video on the screw in fuse is shown below.
Is the breaker turned on? Has it tripped? Is there a blown fuse?
If there are any indicator lights or motors running on the unit? If so, there is power available.
Is the thermostat calling for heat? If the thermostat has a system switch, it should be in the heat position. Is the thermostat set well above the temperature in the structure?
A video on the screw in fuse is shown below.
If there is a breaker in the line, it could be in one of 3 positions.
It could be on, similar to a light switch.
It could be off, again similar to a light switch.
It could be tripped. On most breakers, the switch handle goes to the center. If the breaker is in the center, turn the breaker off, then on again. If it immediately goes to the center again, there is a short in the line and electrical troubleshooting must be done.
It could be on, similar to a light switch.
It could be off, again similar to a light switch.
It could be tripped. On most breakers, the switch handle goes to the center. If the breaker is in the center, turn the breaker off, then on again. If it immediately goes to the center again, there is a short in the line and electrical troubleshooting must be done.
Power to the unit and still nothing happens
The wiring diagram below is not there to confuse you. It shows 2 fuses that may be on the control board. This is a newer boiler with an integrated control. You need to think of the places that fuses may be. They are not just on the wiring coming to the boiler.
There may be a terminal board for thermostat connections. The one on the left is typical. A voltage check can be made between R and C. If voltage is available, then install a jumper between R and W. This will eliminate the thermostat. If the unit runs either the thermostat or the wiring to thermostat is the problem.
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