Rheem 862 27 Series User Manual

TM049 27L Continuous Flow Service Instructions
REV AL – Issued April 2019
This document is stored and maintained electronically by Rheem Technical Support. All printed copies are deemed “uncontrolled”.
51
Error Code 14
Overheat Limiter has activated. There may be a hot spot on the heat exchanger that has
caused the overheat limiter to fault. At a minimum check the following:
1 Check gas type of unit and ensure it matches gas type being used.
2 Check heat exchanger for cracks and/or separations.
3 Check for foreign material that may restrict airflow through the exhaust flue or terminal.
Error Code 14
Is the Over Heat Limiter
resistance correct?
TEST 14
Determine cause of OHL failure.
Replace OHL.
(See replacement procedure 23)
NO
YES
Replace the PCB.
Is the multi-pin connector at
terminal T on control PCB
properly connected?
YES
Fully insert multi-pin connector
into terminal T on control PCB.
NO
Error Code 15
Boiling Safety Device. The heat exchanger is too hot. At a minimum check the following:
1 Check for foreign material that may restrict airflow through the exhaust flue or terminal.
2 Back flush the unit to remove any sediment build up in the heat exchanger.
Error Code 15
Measure the actual hot water
outlet temperature.
Does the measured hot water
temperature match that
indicated by 5y?
Is the resistance of the hot
outlet thermistor normal?
TEST 15
NO
Check the burner pressure and
adjust if necessary. Refer to
section on burner pressure
adjustment.
Replace hot outlet thermistor.NO
Replace PCB.YES
YES
Display maintenance information
‘5y’ on LED1.
Is the resistance of the heat
exchanger thermistor normal?
TEST 15
Replace heat exchanger
thermistor.
YES
NO
Check wiring. Ensure all
connections are securely
fastened.

Rheem 862 27 Series Specifications

General

Brand	Rheem
Model	862 27 Series
Category	Water Heater
Language	English