12. Troubleshooting Guide
PNEG-308 Purafire 45
Troubleshooting Supplement
Summary of Events for Proper Operation
The components of the heater work in conjunction with each other to provide safe and reliable heat when
maintained properly. The sequence of events leading to a consistent output of heat are easy to
understand and to troubleshoot.
1. Power to the heater is turned ON.
2. Brain box performs self-diagnostic check.
3. Brain box ensures that no current passes through the air proving switch.
4. Power is sent to the blower motor.
5. Air from the motor pushes the air proving switch forward allowing current to pass through it.
6. Brain box ensures that ignitor is functioning properly.
7. Current is sent through the High-Limit thermostat to the gas valve.
8. Flame probe verifies that flame is present.
9. Heater continues to run until power is shut off.
Troubleshooting Heater
Before attempting to troubleshooting, ensure that all wires are in their proper positions and connected
securely. It is important that these steps are completed in the order that they are presented.
NOTE: All testing should be done by a qualified technician.
1. Plug heater into power supply and turn the heater ON.
If the blower motor does not turn ON, the LED will flash either 1 or 4 times.
One (1) flashes: Air proving switch stuck in the closed position. Free or replace switch.
Four (4) flashes: Brain box failed self-diagnostic check. Replace brain box.
2. Using a voltmeter, check the voltage across terminals #1 and #2 on the terminal block. This voltage
should be between 210 and 230 VAC on 50 Hz and 105-125 VAC on 60 Hz. If it is not, check the
power supply.
3. Check the voltage across terminals #3 and #4 on the terminal block. This voltage should be
between 18 and 26 VAC. If it is not, replace the transformer.
4. Turn the heater OFF. Disconnect the orange wire from terminal #10 on the brain box. Attach
one (1) lead of the voltmeter to the orange wire and the other lead to ground. Turn the heater ON.
When the blower motor forces enough air to close the air proving switch, the voltmeter should read
about 24 VAC. If no voltage is read, replace air proving switch. If the motor does not start or runs
slowly, check for a dirty blower wheel or bad capacitor.
If the air proving switch does not close after blower motor energizes, the LED will flash 2 times.
5. Turn the heater OFF. Reconnect the orange wire to terminal #10 of the brain box. Disconnect the
gray wire from terminal #5 of the brain box. Connect one (1) lead of the voltmeter to terminal #5
and the other to ground. Turn the heater ON. About 3 seconds after the air proving switch closes,
the voltmeter should read about 24 VAC. If no voltage is read, replace the brain box. If ignitor glows
a dull, red-orange color, disconnect ignitor wires and place an ohmmeter across them. The
ohmmeter should read between 2 and 6 ohms. If the reading is not within this range, replace the
ignitor. LED will flash 3 times if ignitor is bad.
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