HTP Munchkin High Efficiency Heater - Manual (Page 16)

Open Temperature Sensor On Inlet (Probe Fault) — 5 PULSES
! The control will sense an open temperature probe. If an open probe is sensed, the control will go into the lockout state. Verify that the Inlet
probe is properly connected to the control board. If the temperature probe is in an environment of less then 0
°
F then wait for ambient temperature
to rise or apply heat to the unit. If the temperature probe is in an environment of more then 230°F then wait for the temperature to lower below
200°F
Open Temperature Sensor On Outlet (Probe Fault) — 6 PULSES
! The control will sense an open temperature probe. If an open probe is sensed, the control will go into the lockout state.
Verify that the Outlet probe is properly connected to the control board. If the temperature probe is in an environment of less
than 0°F then wait for ambient temperature to rise, or apply heat to the unit. If the temperature probe is in an environment
of more than 230°F, then wait for the temperature to lower below 200°F
Air Pressure Switch Fault Stuck Closed — 7 PULSES
! If the control senses the blower pressure switch is closed when it is expected to be open, the control will wait approximately
90 seconds for the fault condition to clear . If after approximately 90 seconds the control still senses the blower pressure
switch is closed, the control will go into the lockout state. Verify that the blower motor is operational and that the 120VAC
power cable is connected to the blower. Check that the wires are connected to the blower air pressure switch and that the
are pressure switch is functional. This may require turning the screw in the center of the air pressure switch 1 turn clockwis e
to correct (Initial set-up only). After any air pressure switch adjustment, you must cycle the appliance several times to
insure proper operation.
Air Pressure Switch Fault Stuck Open — 8 PULSES
! If the control senses the blower pressure switch is not closed during the pre-purge cycle, the control will attempt two additional pre-purge trials.
If after three pre-purge trials the control is still sensing the blower pressure switch is not closing, the control will enter the lockout state. Check
that the blower motor is off and verify that the blower air pressure switch is functional. This may require turning the screw in the center of the
air pressure switch in 1/4 turn counter-clockwise to correct- (initial set-up only). After any air pressure switch adjustment, you must cycle the
appliance several times to insure proper operation.
Redundant Gas Valve/Gas Valve Relay Stuck ON — 9 PULSES
1. If the controller senses the redundant gas valve or the gas valve relay is stuck ON it will go into the lockout state. Check for short-circuit(s)
from the 24VAC and no continuity between CN4 pins 3 & 4. If the problem persists, replace the control board.
Redundant Gas Valve/Gas Valve Relay Stuck OFF — 10 PULSES
1. If the controller senses the redundant gas valve or if the gas valve relay is stuck OFF it will go into a lockout state. Replace
the control board.
Gas Valve NOT Connected — 11 PULSES
1. If the controller detects that the gas valve is not connected it will go into the lockout state. Check the connection of the gas
valve.
ROM Checksum Failure — 12 PULSES
1. If the controller detects that the ROM check has failed then it will go into a lockout state. Cycle the power from the ON to
OFF state. If the problem persists, you may need to replace the control board.
RAM Test Failure — 13 PULSES
1. If the controller detects that the RAM test failed it will go into a lockout state. Cycle the power from the ON to OFF state.
If the problem persists, you may need to replace the control board.
60Hz Failure — 14 PULSES
1. If the generator, inverter, or other power source does not provide 60Hz then the power source must be replaced. If the power
source used supplies 60Hz then cycle the power from the On to OFF state. If the problem persists, then you may need to
replace the control board.
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