Troubleshooting - Bosch AquaStar 125B LP Installation And Operating Instructions Manual

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TROUBLE SHOOTING
The AquaStar 125 burners are activated by a water flow
valve. Numerous water related problems can cause this
water valve to malfunction such as: Insufficient water flow
volume to activate the burners at its minimum flow
requirement; Dirt in the water flow valve causing it to
malfunction; Sediment build-up in faucet aerators, or
shower heads; Uneven pressures between cold and hot.
(with single lever faucets) Plumbing cross overs. These
water flow related problems can cause the heater to deliver
less than its full output, or to fail to ignite or to shut down
completely.