Munchkin MUNCHKIN HIGH EFFICIENCY HEATER with the "925" Controller Control Board Error Codes

Page 39

 

 

 

 

 

TROUBLESHOOTING

Table 7-1: 925 Control Board Error Codes

 

 

 

 

 

Code

Description

 

Remedy

 

 

 

 

 

1.

Check circulation pump operation

 

 

 

 

High Limit Exceeded.

2.

Assure that there is adequate flow through the boiler by accessing the

 

 

F00

 

 

status menu and assuring that there is less than a 50°F rise from the

 

 

 

 

 

3.

return thermister to the supply thermister.

 

 

 

 

 

Check thermister reading on supply thermister. Replace switch if faulty.

 

 

 

 

 

1.

Push the red reset button on the switch.

 

 

 

 

 

2.

Check the flue temperature during operation using a combustion

 

 

F01

 

Vent Temperature Limit Exceeded.

 

 

 

analyzer.

 

 

 

 

 

3.

 

 

 

 

 

Replace the switch if faulty.

 

 

 

 

Interrupted or Shorted

1.

Check the electrical connection to the thermister on the outlet manifold.

 

 

F02

 

 

 

Supply (Outlet) Thermister.

2.

Replace thermister if necessary.

 

 

 

 

 

 

Interrupted or Shorted

1.

Check the electrical connection to the thermister on the inlet manifold.

 

 

F03

 

 

 

Return (Inlet) Thermister.

2.

Replace thermister if necessary.

 

 

 

 

 

 

Supply (Outlet)

1.

Check circulation pump operation.

 

 

 

 

2.

Assure that there is adequate flow through the boiler by accessing the

 

 

F05

 

 

 

Temperature exceeds 230°F.

 

status menu and assuring that there is less than a 50°F rise from the

 

 

 

 

 

 

return thermister to the supply thermister.

 

 

 

 

Return (Inlet) Temperature

1.

Check circulation pump operation.

 

 

 

 

2.

Assure that there is adequate flow through the boiler by accessing the

 

 

F06

 

 

 

Exceeded 230°F.

 

status menu and assuring that there is less than a 50°F rise from the

 

 

 

 

 

 

 

 

 

return thermister to the supply thermister.

 

 

 

 

No flame detected – The boiler will

1. Watch the igniter through the observation window provided.

 

 

 

 

2.

If there is no spark, check the spark electrode for the proper ¼” gap.

 

 

 

 

make three attempts at ignition

3.

Remove any corrosion from the spark electrod and flame rectifier probe.

 

 

F09

 

 

 

before the control goes into this

4.

If there is a spark but no flame, check the gas supply to the boiler.

 

 

 

 

 

 

lockout condition.

5.

If there is a flame, check the flame sensor.

 

 

 

 

 

6.

Check any flue blockage or condensate blocks.

 

 

 

 

 

1. Monitor the gas pressure to the unit while in operation.

 

 

 

 

 

2.

Assure that the flame is stable when lit.

 

 

 

 

Loss of Flame Signal – The boiler

3.

Check to see if the green light on the display module is out while the

 

 

 

 

 

boiler is running.

 

 

 

 

will relight 4 times before the

 

 

 

F10

 

4.

If the green light doesn’t come on or goes off during operation check

 

 

 

control goes into this lockout

 

 

 

 

 

the flame signal on the status menu.

 

 

 

 

condition.

5.

 

 

 

 

If the signal reads less than 1 microampere, clean the flame rectifier

 

 

 

 

 

 

 

 

 

 

6.

probe.

 

 

 

 

 

If the flame rectifier probe continues to read low, replace it.

 

 

 

 

 

1. Turn the gas off to the unit at the service valve.

 

 

 

 

False Flame Signal – The boiler will

2.

If the flame signal is still present replace the igniter.

 

 

 

 

3.

If the flame signal is not present after turning off the gas supply, check

 

 

F11

 

lock out if it senses a flame signal

 

the gas valve electrical connection.

 

 

 

 

when there should be none present.

4. If there is no power to the gas valve, remove the valve and check for

 

 

 

 

 

5.

obstruction in the valve seat or replace the gas valve.

 

 

 

 

 

Turn the gas on at the service valve after corrective action is taken.

 

 

 

 

Combustion Fan Speed Low – The

 

 

 

 

 

 

boiler will lock out if it senses that

1.

Check the combustion air fan wiring.

 

 

F13

 

the fan speed is less than 70% of

2.

Replace the combustion air fan.

 

 

 

 

expected rate for more than 60

3.

Replace the control board.

 

 

 

 

seconds.

 

 

 

 

 

 

Combustion Fan Speed High – The

1.

Check the combustion air fan wiring.

 

 

 

 

boiler will lock out if the fan speed is

 

 

F14

 

 

 

more than 130% of expected rate

2.

Replace the combustion air fan.

 

 

 

 

 

 

for more than 60 seconds.

3.

Replace the control board.

 

 

 

 

 

 

 

 

 

 

 

1. Make sure the connector is correctly connected to the gas valve.

 

 

 

 

 

2.

Check the electrical wiring from the valve to the control board.

 

 

F18

 

Gas Valve Error

 

 

3.

Replace the low voltage wiring harness assembly.

 

 

 

 

 

 

 

 

 

 

4.

Replace control board.

 

 

 

 

Watchdog

Call factory for further assistance.

 

 

F30

 

 

 

 

 

 

 

 

 

Parameter Memory

Call factory for further assistance.

 

 

F31

 

 

 

 

 

 

 

 

 

Parameter Memory Write Error

Call factory for further assistance.

 

 

F32

 

 

 

 

 

 

 

 

 

Programming Error

Call factory for further assistance.

 

 

F33

 

 

 

 

 

 

 

39

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Contents With the 925 Controller Munchkin High Efficiency HeaterSpecial Attention Boxes Using this ManualTable of Contents Munchkin Ratings and Dimensions Part 1. General InformationHOW IT Operates Recommended Service Clearances Dimensions 80M 140M/199M General PRE-INSTALLATION RequirementPart 2. Electrical Pressure Relief ValveElectrical Connection Electrical Connection Wiring Directly to Central Heating Circulator GAS Table Part 3. GAS ConnectionGAS Connection GAS PipingDungs GAS Valve Approved Venting Materials Part 4. VentingVenting the Munchkin Direct vent terminal clearance Minimum clearance, C Vented Appliance Longer Vent RunsCondensate Removal Heater Removal from a Common Vent SystemDiagrams for Sidewall Venting Venting Diagrams for Vertical Venting Hydronic Piping with Circulators or Zone Valves Part 5. PipingMunchkin T50M Munchkin T80M/80M Munchkin 140M Munchkin 199M Circulator SizingFill and Purge Heating System Piping Illustrations Piping Symbol LegendOFF Zone valves Piping Zone valves Make-up water Piping Space heating zone circuit Zone Circulators Make-up water PB1 PB2 PB1 PB2 Part 6. START-UP Procedures Sequence of OperationItems to be Checked Before Lighting the Munchkin Operating Instructions Lighting InstructionsStatus Menu Adjusting the Temperature on the Munchkin DisplayTo Turn OFF GAS to Appliance Test ModeMunchkin Error Code Part 7. Troubleshooting925 Control Board Error Codes Resistance Tables Before Each Heating Season Part 8. MaintenanceMaintenance Procedures Condensate Cleaning InstructionsMaintenance Munchkin Controller Control Wiring LayoutMaintenance Maintenance Page Page Munchkin R1

MUNCHKIN HIGH EFFICIENCY HEATER with the "925" Controller specifications

The Munchkin High Efficiency Heater, equipped with the advanced "925" Controller, represents a significant advancement in heating technology for both residential and commercial applications. Known for its reliability and exceptional performance, this heater is designed to provide efficient heating while minimizing energy costs and environmental impact.

The Munchkin High Efficiency Heater operates on a condensing technology that extracts heat from exhaust gases. This process allows for higher efficiency rates, often exceeding 95%. By recovering heat that would otherwise be lost, the heater maximizes energy utilization, making it an eco-friendly choice for homeowners and businesses alike.

One of the standout features of the Munchkin 925 Controller is its user-friendly interface, which allows for effortless operation and monitoring of the heating system. The controller comes with advanced diagnostic capabilities that provide real-time feedback on system performance. Users can easily adjust settings, program schedules, and monitor energy consumption, ensuring optimal comfort and efficiency.

Furthermore, the Munchkin High Efficiency Heater is equipped with a variety of features that enhance its performance and user experience. The unit is designed with a durable heat exchanger made from stainless steel, which not only improves heat transfer but also ensures longevity and resistance to corrosion.

The heater operates quietly, making it suitable for installation in residential settings, including bedrooms and living spaces. Additionally, its compact design allows for flexible installation options, even in constrained spaces. The Munchkin unit is also compatible with multiple venting options, providing further versatility in installation configuration.

Safety features are a priority in the design of the Munchkin Heater. It includes built-in freeze protection, ensuring that the system operates effectively even in low temperatures. The unit also has an array of safety sensors that monitor for conditions such as flue blockage and overheating, triggering automatic shut-off mechanisms to prevent potential hazards.

In conclusion, the Munchkin High Efficiency Heater with the "925" Controller is a cutting-edge solution for efficient heating. With its superior performance, advanced controller system, durable construction, and comprehensive safety features, it remains a top choice for those looking to improve their heating efficiency while reducing energy consumption. Whether it's for residential or commercial use, the Munchkin heater promises reliability and comfort in any environment.
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