CFM UVHB20 Electric Heater User Manual


 
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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