Water Heater Piezo Igniter Won't Spark
The Short Answer: A piezo is a push-button spark, not a DSI board. No click is a dead crystal or a seized button. A click with no snap at the electrode is a wet ceramic, an open wire, or a gap the spark will not jump. Spark with no flame is gas, not the igniter. One test. Smell gas, leave.
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Search Intent & The Real Problem
You mashed the red button. You heard a tick, or you heard nothing. The pilot stayed dark. Forums sold you a $9 “universal piezo” and a video of someone cracking the union. A piezo only makes a spark. It does not open gas, hold a thermocouple, or replace a DSI module. If the heater clicks by itself with no button, you are on electronic ignition — Suburban DSI electrode or Atwood clicking — not this page.
Older Atwood and Suburban standing-pilot coaches use the same push-button on the exterior door. Same diagnosis, smaller bay. Do not keep clicking propane into a cabinet.
What other guides get wrong
They treat every click as a Suburban Phase 3 board. Piezo is a crystal you compress with a button; DSI is a 12-volt module that sparks on its own. They also tell you to sand the electrode while the gas is on, or to swap the whole gas valve because the button feels mushy. The button is often a separate module. They skip “control not on PILOT,” which is how a perfect spark lights nothing.
Step-by-Step Troubleshooting
Step 1: Prove it is a piezo, not DSI or hot-surface
| What you have | Spark comes from | This page? |
|---|---|---|
| Standing pilot, red/black push-button, you click it | Piezo crystal | Yes |
| Auto tick-tick at the door, no button, RV DSI | Board + electrode | No — Suburban / Atwood links above |
| No view port, status LED, “do not light with a match” | Hot-surface or spark module | No — stay lit |
| Electronic FVIR control, flashing LED | Control, not a piezo | Richmond/Rheem valve |
- What to look for: Jacket lighting card with a push-button callout. Knob that actually says PILOT. A battery pack or a 24-volt module is not a piezo.
- Required tools: Flashlight, phone photo of the valve and the button.
Step 2: Split no-click from click-no-spark from spark-no-flame
| Sound / sight | Meaning | Next |
|---|---|---|
| Button mushy, no tick | Dead crystal, broken striker, seized button | Replace the piezo module — not the tank |
| Sharp tick at the button, no snap at the hood | Wire off, cracked ceramic, wet tip, gap too wide | Electrode path |
| Blue-white snap at the hood, no flame | Control not on PILOT, cock closed, orifice, no gas | Fuel path; igniter is fine |
| Spark jumps to the bracket / jacket | Cracked ceramic or stripped insulation | Electrode or lead |
| Spark once, then nothing, gas smell | Stop. Unburned fuel in the chamber | Leave. Not a second click. |
- What to look for: Which row you actually have. Guessing “bad piezo” from the Amazon title is how you buy a button for a closed gas cock.
- Required tools: Ears and eyes at the view port. Gas cock handle parallel to the pipe (open).
Step 3: Spark path — electrode, gap, water
- What to look for: Control to OFF. Wait five minutes with the area clear. Ceramic dry and white, not carbon-tracked or split. High-voltage lead fully on the terminal, insulation not melted to bare wire. Gap at the pilot hood about 1/8” (3 mm) — a business card, not a pretzel. Water on the tip from a draft-hood drip or a T&P tracking down will kill the spark every time; that water is a different job — dripping on the pilot.
- Required tools: Eyes. A dry cloth on a cool ceramic. No screwdriver shorted across the rod “to test it.”
FVIR tanks: the burner door is a combustion seal. Do not pull it to chase a piezo if you cannot reseal it. Look through the port.
Step 4: Gas to the pilot — without opening the pipe
- What to look for: Knob on PILOT, not ON or OFF. Hold per the jacket (typically 30–60 seconds after a flame, not before). Appliance shutoff open. Other gas appliances lighting. LP bottles not empty. A piezo can throw a perfect spark into a valve that is still on OFF.
- Required tools: The lighting card. A long lighter only if that card says so — and only after five minutes off.
If you have spark and still no flame, the igniter is not the part. Pilot orifice, closed control, or supply. Manometer work is licensed (typically about 3.5–7 in. w.c. natural gas / 10–11 in. w.c. LP at the appliance — confirm the rating plate). Do not crack the union to “see if you have gas.”
Step 5: When the piezo itself is dead
- What to look for: No tick after a dry electrode and a seated lead. Button that never returns. Spark at your knuckle on the button body (the lead is shorted to chassis). Module cracked. On many Robertshaw / White-Rodgers / Honeywell standing-pilot valves the piezo unplugs as its own part; on some it is clipped to the burner bracket. Match the electrode and the lead to your valve, not a “universal” photo.
- Required tools: Gas off. The exact module. No PTFE on a ceramic electrode.
A new piezo that still will not light a pilot is not a second igniter. You are in pilot will not stay lit territory — thermocouple, draft, or the valve.
When DIY Ends: Calling a Licensed Pro
Stop at gas odor, delayed-ignition bangs, an FVIR door you would have to pull, a melted lead, and any valve work. You may follow the jacket once, dry a wet ceramic, confirm the shutoff, and click one spark test with the control on PILOT. You may not keep clicking, loosen fittings, or jumper anything. A licensed plumber will prove spark, prove pilot gas, and leak-test if the electrode or valve comes apart. A $9 button on a $200 control you just contaminated is how this becomes a second visit.
Frequently Asked Questions
Q: Why won’t my water heater piezo igniter spark? A: Dead crystal or seized button if there is no click. Wet or cracked electrode, open lead, or a wide gap if it clicks with no snap at the hood. Spark with no flame is the gas control or supply, not the piezo.
Q: Can I replace a piezo igniter myself? A: The push-button module is often a separate part and is not a gas fitting if you never break the pipe. The electrode on an FVIR burner is a combustion-seal job. If the first spark test fails, hire a licensed plumber.
Q: The piezo sparks but the pilot still will not light. Is the igniter bad? A: No. Spark proved the igniter. Put the knob on PILOT, confirm the shutoff, and stop if there is still no flame — that is gas, orifice, or the valve.