Pool Heater Guide
Pool Heater Won't Ignite? Gas Issues & Troubleshooting
Diagnose and fix common pool heater ignition problems. Most issues are gas-related and fixable.
Why Your Pool Heater Won't Ignite
Common Gas-Related Problems
1. Low Gas Pressure
Symptoms: Heater won't ignite or flame is very weak
Cause: Undersized gas line, meter pressure too low, or regulator failure
2. Gas Valve Blockage
Symptoms: No gas flow, heater clicking but not igniting
Cause: Debris in gas line, sediment in valve, or corroded connections
3. Pilot Light Issues
Symptoms: Pilot won't light or keeps going out
Cause: Dirty pilot orifice, wind exposure, or thermocouple failure
4. Air in Gas Line
Symptoms: Heater starts then shuts off, or won't stay lit
Cause: Recent gas line work, loose connections, or meter shutdown
Quick Troubleshooting Steps
- 1. Check gas valve: Make sure it's fully open (handle parallel to pipe)
- 2. Inspect connections: Look for loose fittings or corrosion
- 3. Listen for hissing: Gas leak? Turn off immediately and call us
- 4. Check pilot: Can you see a small flame? If not, pilot is out
- 5. Bleed air: Open heater bleed valve to release air from line
When to Call a Professional
Call immediately if you:
- • Smell gas (safety hazard)
- • See gas leaking from connections
- • Hear unusual hissing or popping sounds
- • Have already tried basic troubleshooting
Need Professional Repair?
AG Gas Service provides same-day pool heater repair. We diagnose gas issues and get your heater running.