13
SAVE A SERVICE CALL
Check the items below before making a service call. You will be charged for attending to any
condition or fault that is not related to manufacture or failure of a part.
NOT ENOUGH HOT WATER (OR NO HOT WATER)
• Is the electricity switched on?
Inspect the isolation switch adjacent to the water heater and ensure the isolation switch is turned on.
• Are 3 phase pumps wired correctly?
Have an electrician inspect the wiring of 3 phase pumps for correct rotation.
• Is the BMS system timed out?
Check the settings on the BMS to ensure they are suitable to enable heating when required.
• Is the ignition system ‘locked out’?
Reset the water heater.
Refer to “To Reset the Water Heater” on page 82.
• Is a code displayed on the control panel?
Check the display on the control panel (refer to the
“MVB Error Codes” on page 13).
• Are you using more hot water than you think?
Are outlets (especially the showers) using more hot water than you think? Very often it is not realised
the amount of hot water used, particularly when showering. Carefully review the hot water usage.
Have your plumber fit a flow control valve to each shower outlet to reduce water usage.
• Pressure relief valve running
Is the relief valve discharging too much water? (
Refer to “Water Pressure Specifications” on page 27).
• Electronic thermostat temperature setting
Ensure the electronic thermostat temperature setting (set point) is appropriate. You may choose to
have your installer adjust the temperature setting upwards to gain additional hot water capacity.
Warning:
Hotter water increases the risk of scald injury.
• Water heater size
Do you have the correct size water heater for your requirements? The sizing guide in the Raypak
sales literature and on the Rheem website (www.rheem.com.au) suggests average sizes.
MVB ERROR CODES
If any of the sensors detect an abnormal condition or an internal component fails during the operation
of the MVB, the display may show the error. This code may either be the result of a temporary condition
in which case the display will revert to its normal readout when the condition is corrected, or it may be
the result of a condition that the controller has evaluated as not safe to restart the unit. In this case, the
unit control will be locked out, requiring the maintenance person to manually reset the control by
pressing and releasing the
RESET
button.
