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PYROMASTER® UVHB20 Vent-Free Heaters
20001540
Troubleshooting - Honeywell VS8421
• Supply line hooked up
• Shutoff valve open
• Lockout has engaged. Wait 60 seconds, try
again.
• For spark at electrode while depressing
Piezo - 1/8" gap to pilot hood needed.
• All wiring connections
• Replace Piezo ignitor
• For air in the lines
• Thermopile needs a minimum 325mV.
Adjust pilot flame height.
• All wiring connections
• Replace Thermopile
• Thermocouple needs a minimum of 14mV.
• Defective valve. Turn to pilot, meter should
read greater than 100mV. If not, replace.
• Valve is turned ON.
• Wall switch is not turned ON. Watch for
grounded wires!
• Themopile needs a minimum 325mV.
• Plugged burner orifice.
NO
NO
START
CHECK
NO
NO
Gas Supply On
YES
Pilot Lights with
Piezo Ignitor
YES
Pilot Stays Lit
YES
Pilot Lights
Main Burner
YES
System OK