GAS-FIRED HEATER Installation Manual
PART 14: TROUBLESHOOTING
A. MUNCHKIN ERROR CODE
An error code may occur in the installation of the Munchkin Contender. This condition may lead to a lock out condition of the controller, which will need to be manually reset through the S4/Reset button. These temporary codes will help the installer correct the problem before going into a lock out condition, which will require a manual reset.
B.HEATER ERROR
1.When an error condition occurs the controller will display an error code on the display module.
2.These error codes and several suggested corrective actions are included in Table
3.In the case of E00, E13, and E14 this error, if uncorrected, will go into a fault condition as described is Paragraph C (Heater Fault).
C.HEATER FAULT
WARNING
When servicing or replacing any components of this heater be certain that:
•The gas is off.
•All electrical power is disconnected
DANGER
When servicing or replacing that are in direct contact with the heater water, be certain that:
•There is no pressure in the heater. (Pull the release on the relief valve. Do not depend on the pressure gauge reading).
•The heater 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 heater and to repair or replace any part of the heater which has been under water.
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
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.
Table 14-1 : 925 Control Board ERROR Codes
CAUTION
This appliance has wire function labels on all internal wiring. Observe the position of each wire before re- moving it. Wiring errors may cause improper and dan- gerous 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 heater damage. Instead, shut off the gas supply to the heater at the gas service valve.
Code | Description | Duration |
| Corrective Action | |
|
|
|
|
| |
| Combustion Fan Speed Low.The |
| 1. | Check the combustion air fan wiring. | |
E13 | heater combustion air fan speed less | 60 Sec. | 2. | Replace the combustion air fan. | |
| than 70% of expected. |
| 3. | Replace the control board. | |
| Combustion Fan Speed High. The |
| 1. | Check the combustion air fan wiring. | |
E14 | heater combustion air fan speed is | 60 Sec. | 2. | Replace the combustion air fan. | |
| more than 130% of expected. |
| 3. | Replace the control board. | |
PR0 | Water Pressure Switch Open | Until | 1. | Assure that the system pressure is above 10 psig. | |
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. (If | ||
Corrected | |||||
|
|
| the switch is not functioning properly, replace it.) | ||
|
|
|
|
59
