Robertshaw Millivolt Tests
Contents
1. Voltage drop across the switch terminals Burner on 35 mv or less Set meter to MV or Volts DC Place one lead to TP TH and place one lead to TH If higher than 35mv check connections and switch REGENCY Valve Operating Head Test Symptom Intermittent shutdown or main burner fails when burner switch or thermostat is turned on Before conducting this test disconnect all leads from valve set meter to Ohms for this test One lead to TH TP and one to TP One lead to TP and one to TH Q 10 9 Ohms Good 1 5 1 7 Ohms Good Infinite ohms bad Infinite ohms bad FIREPLACE PRODUCTS Circuit Millivolt Check Symptom Intermittent shutdown or main burner will not light with on off switch The Thermopile energized by the pilot flame generates sufficient power to operate the gas valve and on off switch Set meter to Ohms Place one lead to each spade switch in on position If higher than 0 3 ohms replace switch2. Robertshaw Millivolt Troubleshooting Guide Gas Products 1 Safety Magnet Testing 2 Thermopile Millivolt Check 3 Circuit Millivolt Check 4 Valve Operating Head Test REGENCY Electromagnet power unit EPU testing Set meter to Ohms for this test To take an Ohms reading on a safety magnet remove EPU wire from the valve Place one meter lead to the EPU wire spade and one to TP Good reading is 0 to 13 Ohms If the reading is higher magnet is defective therefore Change the Valve Do not try to repair Good Reading FIREPLACE PRODUCTS Thermopile Millivolt Check Symptom Intermittent shutdown or main burner will not light with on off switch Set meter to Volts DC Millivolts Place on lead to TP TH amp TP Thermopile Output MAIN BURNER OFF 325 mv minimum required for system to operate any If lower than 325 mv change the thermoplle REGENCY Thermopile Millivolt Check Symptom Intermittent shutdown or main burner will not light with on off switch Thermopile Output MAIN BURNER ON 110 mv minimum required for system to operate consistently If lower than 110 mv conduct valve operating head test If valve proves good change the thermopile ay FIREPLACE PRODUCTS Circuit Millivolt Check Symptom Intermittent shutdown or main burner will not light with on off switch The Thermopile energized by the pilot flame generates sufficient power to operate the gas valve and on off switch
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