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Heater Errors
When an error condition occurs, the controller will display an error code on the user interface. These
error codes and several suggested corrective actions are included in the MVB Fault Text section on
page 14.
Heater Faults
When a fault condition occurs, the controller will flash a red light on the PIM™ and display the error
1.
code in the Toolbox menu on the user interface. The alarm output will also be activated. Most fault
conditions will also cause the water heater pump to run in an attempt to cool the unit.
Note the error code, either through the flash code on the PIM™ and/or from the Toolbox menu on
2.
the user interface, and reference the explanation of the fault along with troubleshooting steps in
the MVB fault text section.
3.
Press and release the RESET button to clear the fault on the user interface and resume operation.
Be sure to observe the operation of the unit for a period of time to ensure correct operation and no
reoccurrence of fault code(s).
DANGER: When servicing or replacing components that are in direct contact with the water, be certain
that:
•
There is no pressure in the water heater. (Isolate the water heater. Raise the release on the relief
valve. Do not depend on the pressure gauge reading).
•
The water heater water is not hot.
•
The electrical power is off.
WARNING: When servicing or replacing any components of this unit be certain that:
•
The gas is off.
•
All electrical power is disconnected.
WARNING: Do not use this appliance if any part has been under water. Improper or dangerous
operation may result. Contact a qualified service technician to inspect the water heater and to repair or
replace any part of the water heater that has been under water prior to placing the water heater back in
operation.
CAUTION: Wiring errors can cause improper and dangerous operation. Verify proper operation after
servicing. See wiring diagram.
CAUTION: If overheating occurs or the gas supply fails to shut off, do not turn off electrical power to
the circulating pump. This may aggravate the problem and increase the likelihood of water heater
damage.
Instead, shut off the gas supply to the water heater at the gas isolating valve.
MVB FAULT TEXT
Error Display
If there is an active error, then it is displayed as the first item in the Toolbox Menu and it is the default
display for the control until the error is resolved.
14
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