2 Copy edited.
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  1. Disconnect the heater. If the glitch persists, try a capcapacitor across the coil driver , if. If long distance, add a line filter to the coil wires with a common mode choke and twisted pair.
  2. Connect the heater, if. If a disconnect fixes the problem and if the glitch persists, add a snubber without 120 ohmsohm on AC or. Or an LC filter using X rated capscapacitors.
  3. Use low ESR caps-ESR capacitors near Relaythe relay power draw.
  1. Disconnect heater. If glitch persists, try a cap across coil driver , if long distance add line filter to coil wires with common mode choke and twisted pair
  2. Connect heater, if disconnect fixes problem and if glitch persists add snubber without 120 ohms on AC or LC filter using X rated caps.
  3. Use low ESR caps near Relay power draw.
  1. Disconnect the heater. If the glitch persists, try a capacitor across the coil driver. If long distance, add a line filter to the coil wires with a common mode choke and twisted pair.
  2. Connect the heater. If a disconnect fixes the problem and if the glitch persists, add a snubber without 120 ohm on AC. Or an LC filter using X rated capacitors.
  3. Use low-ESR capacitors near the relay power draw.
1
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  1. Disconnect heater. If glitch persists, try a cap across coil driver , if long distance add line filter to coil wires with common mode choke and twisted pair
  2. Connect heater, if disconnect fixes problem and if glitch persists add snubber without 120 ohms on AC or LC filter using X rated caps.
  3. Use low ESR caps near Relay power draw.