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DANGER: When servicing or replacing components
A
that are in direct contact with the water, be certain that:
•
There is no pressure in the boiler. (Pull the release
on the relief valve. Do not depend on the pressure
gauge reading).
•
The boiler water is not hot.
•
The electrical power is off.
A
WARNING: When servicing or replacing any
components of this unit be certain that:
•
The gas is off.
•
All electrical power is disconnected.
MVB Fault Text
Error Display
If there is an active error, then it is displayed as the first item in the Boiler Menu and it is the default display for the control
until the error is resolved.
Error Item
OUTLET SEN
LIMIT SEN
INLET SEN
GAS PRESS
IGNITION
LIMIT TRIP
FLAME
ID CARD
IGN CTRL
DELTA T
LOW 24VAC
BLOW SPEED
Check the outlet water sensor and its wiring.
Check the high limit sensor and its wiring.
Check the inlet sensor and its wiring.
Check PIM wiring.
Reset control, push and release RESET button.
Boiler temperature tripped the high limit.
False flame detected. Shut off gas supply, recycle power.
Identity card, check ID card and wiring.
Internal control fault. Reset power, replace control.
Temperature difference between the inlet and outlet exceeded the set point. Check water
flow.
Low 24 VAC power. Check power supply wiring and transformer.
Blower speed out of range. Check blower wiring and blower.
Table T.
WARNING: Do not use this appliance if any part has
A
been under water. Improper or dangerous operation may
result. Contact a qualified service technician to inspect
the boiler and to repair or replace any part of the boiler
that has been under water prior to placing the boiler
back in operation.
CAUTION: Wiring errors can cause improper and
A
dangerous operation. Verify proper operation after
servicing. See wiring diagram.
CAUTION: If overheating occurs or the gas supply
A
fails to shut off, do not turn off electrical power to the
circulating pump. This may aggravate the problem and
increase the likelihood of boiler damage. Instead, shut
off the gas supply to the boiler at the gas service valve.
Description and Troubleshooting
Error Display
47
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