ACV HeatMaster 201 - Stand-By Screen; Lockout Screen; Status Messages

Low Water
Water pressure has fallen below
0.7 bar. Increase pressure
to normal range.
If problem persists,
call for service
E37
Lockout reference code. Refer to “In case of Prob-
lem...” on page 7 for more information.
Body text. The rst sentence describes the lockout,
the second sentence gives a possible cure, and the
third tells how to reset the lockout.
Lockout message. Refer to “In case of Problem...”
on page 7 for more information.
Stand-by
84°C
61°C
Target = --
HeatMaster
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USER’S GUIDE
LOCKOUT SCREEN
If a problem occurs, the Lockout screen replaces the Home screen. The backlight also remains on as long
as the problem is not solved. Pressing any arrow button will return to the Home screen.
Using the code located in the right bottom corner of the screen, troubleshoot the problem, either with
the table located in paragraph “In case of Problem...” on page 7, or with the Lockout code table in the
Installer’s Handbook (for the installer only).
STANDBY SCREEN
This screen is displayed at start-up. It indicates that the appliance is ready to respond when a demand is
received.
STATUS MESSAGES
Stand-by Indicates that the appliance is ready to respond when a demand is received.
CH Demand A central heating call has been received.
DHW Demand A domestic hot water call has been received.
CH / DHW Demand Central heating and domestic hot water calls are being received simultaneous-
ly. Both calls are being satised simultaneously because domestic hot water
priority has been disabled.
DHW Priority Central heating and domestic hot water calls are being received simultaneous-
ly. Domestic hot water call is being satised rst because it has priority over
central heating calls.
Priority Timeout Central heating and domestic hot water calls are being received simultaneous-
ly. The domestic hot water priority time limit has been exceeded. Priority will
now switch back and forth between central heating and domestic hot water
calls until one call is satised.
External Demand An external modulation call has been received.
Manual Operation The burner or circulators have manually been enabled in the Installer Menu.
CH Burner Delay The burner will not re until the call blocking time has elapsed.
DHW Burner Delay The burner will not re until the call blocking time has elapsed.
CH Setpoint Reached The burner is not red because the supply/system water temperature exceeds
the setpoint. The central heating circulator continues to operate and the burner
will re again once the supply/system water temperature drops below the set-
point.
DHW Setpoint Reached The burner is not red because the supply/system water temperature exceeds
the setpoint. The domestic circulator continues to operate and the burner will
re again once the supply/system water temperature drops below the setpoint.
CH Post Pump The central heating circulator is running to remove heat from the HeatMaster at
the completion of a call.
DHW Post Pump The domestic hot water circulator is running to remove heat from the HeatMas-
ter at the completion of a call.
Freeze Protection The burner is red because the freeze protection feature has been activated.
Freeze protection will end once the supply/system water temperature is raised
to16°C.
Boiler Protection The burner ring rate is being reduced because of an excessive dierence be-
tween the appliance supply and return temperatures. The ring rate will begin
increasing once the temperature dierence is less than 25°C.
Lockout Description The lockout which currently has the HeatMaster shut down is displayed