1. Is the system switch on?
2. Is the thermostat up to temperature?
3. Is the pump running with a clean filter less than or equal to 16 psi on pressure gauge?
4. Is the gas valve in the on position?
5. Is the pilot lit?
6. Is the gas supply valve open?
7. Are all plumbing and filter valves open?
8. If a bypass is installed, is it properly adjusted?
9. Contact a qualified technician if you still cannot find the problem.

This could be due to low gas pressure, inadequate air supply, or improper venting. Make sure gas is turned on; with propane, make sure the tank has fuel. Also check for water run-off from roof or sprinklers.

The thermostat may be set too low. If the heat loss is greater than the heater input - the heater may be too small, outside air temperature is too low, inadequate gas supply. You may want to install a solar cover to slow heat loss.

Inadequate water flow due to a dirty filter, closed valve, external bypass needs adjusting, reversed water connections, or pressure switch out of adjustment. It is also possible that your thermostat is out of calibration or needs replacing.

See previous two questions for additional information. Also check for water run off from above or sprinklers directed at heater. A high wind stack may be needed due to heater location. Further troubleshooting will require a service technician.

Review the Owner's Manual if you do not find your answer, turn the heater off and contact a qualified servicer.

The heat exchanger may be leaking because of chemical or sanitizer damage. The damage may be from winter freeze - usually leaking upon spring start-up. Contact a qualified pool service technician.

This may be caused by condensation (occurring when heating very cold water); a missing or damaged bypass; or excessive water flow through the heater from an oversized pump.

Either low gas pressure and/or inadequate air supply and venting, review the installation requirements in the Owner's Manual. Both conditions may need to be evaluated by a qualified service technician.

One, or a combination of the following: low gas pressure, downdrafting, air supply, and venting. The heater may need a high wind stack, if installed near a vertical wall or windy area. Contact a qualified service professional.

Sanitizers or chemical imbalance can deteriorate protective coatings on heater components and create rust. Rebalance chemicals and replace damaged components.

Low gas pressure can cause whistling in the burners. Check your Owner's Guide or contact your installer.

No. Hayward heaters cool down immediately after shut down.

All heaters should be installed on a non-combustible material, such as concrete or block.

Yes, specific conditions apply. Please consult your Owner's Manual for complete details.

Propane heaters use one gallon of fuel per hour for each 91,000 BTU's of heater input.

Example: A 250,000 BTU heater uses: 250,000/91,000 = 2.75 gallon per hour

Natural gas heaters use one therm (100,000) BTU per 100,000 BTU's heater size. Your gas is usually billed by therms.

• Purchase an energy efficient model.
• Use a pool blanket on your oasis when not in use.