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Hot water flow on - Pre-Trial for Ignition
Water Flow Sensor:
As the water flow increases the board will increase the BTU's to compensate for the lower temperature rise. As the
water flow decreases the board will decrease the BTU's to compensate for the higher temperature rise.
The water flow sensor or water flow meter gives the actual water flow measurement to the control board. As water flows
through the flow meter. The fins in the flow meter spin the water through the flow meter which turn the magnetic impeller.
The board sends 5vdc to the flow meter. The Reed switch on the side of the flow meter turns on and off quickly as the
magnetic impeller turns past it. This changes the "frequency" of the power coming back to the board. The board actually
reads the "frequency" determining how fast the impellers are turning. The flow meter cannot be tested with a resistance
check.
The simplest way to determine that the board has confirmed that the water flow meter has engaged is by examining
UCP. If the water flow icon (a shower head symbol) is active on the User Control Panel when the hot water faucet is
turned on then the flow meter can be eliminated.
The control board starts the operation of the water heater when the water flow exceeds .80 GPM (+/- 10%).
Confirm the actual water flow by timing how long it takes to fill a gallon container. Divide 60 seconds by the seconds
measured to come up with the GPM.
If the water flow is too low then you will need to inspect the
Valve
adjustment on the water heater. Ensure that it is opened all of the way
up.
Other causes of reduced water flow are plumbing restrictions, pressure
regulators, water filters and insufficient shore or pump water pressure.
Water Control
9
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Troubleshooting
Need help?
Do you have a question about the GSWH-2 and is the answer not in the manual?
Questions and answers
Heater only gets to105 temp
On my Girard tankless water heater, there are no error codes, the UPC power switch comes on, the temperature display comes on, the flow sensor has been replaced, the GPM is correct, the voltage on the flow sensor is correct, But the gas, shower, and **** symbols do not come on. What could be the issue keeping it from working properly?
If the gas, shower, and other symbols do not come on despite the power switch, temperature display, and flow sensor being functional, the issue could be due to one of the following reasons:
1. Insufficient Water Flow – The unit requires a minimum water flow of 0.70 GPM (+/- 10%) to operate. If the flow is too low, the heater will not activate.
2. Gas Supply Issue – Ensure the LP gas supply is turned on, and there are no restrictions or blockages in the gas line.
3. Flame Detection Failure – If the burner does not ignite or the flame sensor does not detect a flame, the system will not proceed with operation.
4. Electrical Power Issue – The heater requires a stable 12VDC power supply. If the voltage drops below 10VDC, the unit will not function.
5. Faulty Components – A malfunction in the gas valve, blower, or electronic control system could prevent normal operation.
Checking these factors should help identify and resolve the issue.
This answer is automatically generated