Guardian PowerVent Training Manual SVC900; Rev 1
Page 46
Error 4
Indications Display
The pressure switch remained open longer than
5 seconds after the combustion blower
energized.
Troubleshooting
1. The pressure switch wiring is incorrect or disconnected.
2. The pressure switch tubing in not connected correctly or pinched off.
3. Obstructions or restrictions in the water heater exhaust venting. Remove venting and
recycle to rule out venting. If unit goes to main burner, the venting is the problem. If the
code repeats, replace inducer/pressure switch.
Error 5
Indications Display
The self diagnostic test has detected an error in
the Hot
Surface Ignitor circuit.
Troubleshooting
1. Check that the wiring harness Molex is connected and secure.
2. Disconnect the ignitor connector and measure the ignitor resistance with an ohmmeter
between pins 1 and 2. Resistance should be between 11.5 and 18.8 ohms.
3. If the reading is incorrect, replace the Hot Surface Ignitor.
4. If the above checks are good, replace the INTELLI-VENTTM control.
Error 6
Indications Display
The maximum number of ignition retries or
recycles has been reached and the system is in
lockout. (This means there was no flame
rectification to the control to verify main
burner.)
Troubleshooting
1. Check if the gas supply is off or too low to operate.
2. Check the flame sense rod to see that it is located properly and free from contamination.
Reposition the flame sense rod or lightly clean with an abrasive cloth.
3. The Hot Surface Ignitor may not be positioned on the burner correctly. Reposition as
necessary.
4. Low voltage to the water heater. (Verify the hot surface ignitor glows by recycling power
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