Munchkin MUNCHKIN HIGH EFFICIENCY HEATER with the "925" Controller manual Part 7. Troubleshooting

Page 38

TROUBLESHOOTING

PART 7. TROUBLESHOOTING

A. MUNCHKIN ERROR CODE

An error code may occur in the installation of the Munchkin. This condition may lead to a lock out con- dition of the controller, which will need to be manu- ally reset through the S4/Reset button. These tempo- rary codes will help the installer correct the problem before going into a lock out condition, which will require a manual reset.

B. BOILER ERROR

1.When an error condition occurs the con- troller will display an error code on the dis- play module.

2.These error codes and several suggested corrective actions are included in Table 7.1.

3.In the case of E00, E13, and E14 this error, if uncorrected, will go into a fault condition as described is Paragraph C (Boiler Fault).

C.BOILER FAULT

1.When a fault condition occurs the controller will illuminate the red “fault” indication light and display a fault code in the format (Example: F00 ) on the display module.

2.Note the fault code and refer to Table 7.2 for an explanation of the fault code along with several suggestions for corrective actions.

3.Press the reset key to clear the fault and resume operation. Be sure to observe the operation of the unit to prevent a recurrence of the fault.

WARNING

When servicing or replacing any components of this boiler be certain that:

•The gas is off.

•All electrical power is disconnected

DANGER

When servicing or replacing that are in direct contact with the boiler 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

WARNING

Do not use this appliance if any part has been under water. Improper or dangerous operation may result. Contact a qualified service technician immediately to inspect the boiler and to repair or replace any part of the boiler which has been under water.

CAUTION

This appliance has wire function labels on all internal wiring. Observe the position of each wire before removing it. Wiring errors may cause improper and dangerous operation. Verify proper operation after servicing.

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 boiler damage. Instead, shut off the gas supply to the boiler at the gas service valve.

Code

Description

Duration

 

Corrective Action

 

 

 

 

 

1. Check circulation pump operation.

 

 

 

 

 

2.

Assure that there is adequate flow through the

 

 

 

 

 

 

boiler by accessing the status menu and assuring

 

E00

 

High Limit Exceeded

50 Sec.

 

 

 

 

that there is less than a 50°F rise from the return

 

 

 

 

 

 

 

 

 

 

 

3.

thermister to the supply thermister.

 

 

 

 

 

Replace switch if faulty.

 

 

 

Combustion Fan Speed Low.

 

1.

Check the combustion air fan wiring.

 

E13

 

 

 

 

The boiler combustion air fan

60 Sec.

2.

Replace the combustion air fan.

 

 

 

speed less than 70% of expected.

 

3.

Replace the control board.

 

 

 

Combustion Fan Speed High. The

 

1.

Check the combustion air fan wiring.

 

E14

 

 

 

 

boiler combustion air fan speed is

60 Sec.

2.

Replace the combustion air fan.

 

 

 

more than 130% of expected.

 

3.

Replace the control board.

 

 

 

 

Until

1.

Assure that the system pressure is above 10 psig.

 

PR0

 

Pressure Switch Open

 

 

Corrected

2.

Check for leaks in the system piping.

 

 

 

 

 

 

 

 

Until

1. Assure that the vent is not blocked

 

FLU

 

Blocked Vent Pressure Switch Open

2.

Check the switch operation by applying a jumper.

 

 

Corrected

 

 

 

 

 

(If the switch is not functioning properly, replace it.)

 

 

 

 

 

 

38

Page 37 Page 39
Image 38
Page 37 Page 39
Contents Munchkin High Efficiency Heater With the 925 ControllerUsing this Manual Special Attention BoxesTable of Contents HOW IT Operates Munchkin Ratings and DimensionsPart 1. General Information Recommended Service Clearances Dimensions 80M 140M/199M PRE-INSTALLATION Requirement GeneralElectrical Connection Part 2. ElectricalPressure Relief Valve Electrical Connection Wiring Directly to Central Heating Circulator GAS Piping Part 3. GAS ConnectionGAS Connection GAS TableDungs GAS Valve Part 4. Venting Approved Venting MaterialsVenting the Munchkin Direct vent terminal clearance Minimum clearance, C Longer Vent Runs Vented ApplianceHeater Removal from a Common Vent System Condensate RemovalDiagrams for Sidewall Venting Venting Diagrams for Vertical Venting Part 5. Piping Hydronic Piping with Circulators or Zone ValvesCirculator Sizing Munchkin T50M Munchkin T80M/80M Munchkin 140M Munchkin 199MFill and Purge Heating System Piping Symbol Legend Piping IllustrationsOFF Zone valves Piping Zone valves Make-up water Piping Space heating zone circuit Zone Circulators Make-up water PB1 PB2 PB1 PB2 Items to be Checked Before Lighting the Munchkin Part 6. START-UP ProceduresSequence of Operation Lighting Instructions Operating InstructionsAdjusting the Temperature on the Munchkin Display Status MenuTest Mode To Turn OFF GAS to AppliancePart 7. Troubleshooting Munchkin Error Code925 Control Board Error Codes Resistance Tables Condensate Cleaning Instructions Part 8. MaintenanceMaintenance Procedures Before Each Heating SeasonMaintenance Control Wiring Layout Munchkin ControllerMaintenance 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.
Top Page Image Contents