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”.
12
Water Body & PCB Modification
Domestic models (874/876/864/866) manufactured from January 2018 and commercial
models (872/862) manufactured from February 2018 are fitted with a revised water body
and PCB.
The revised water body features a new flow turbine design and a material change to the
water body retaining ring. The PCB has been modified to suit this new water body assembly.
The revised water body can be identified by a black plug on the flow sensor wiring loom
(refer to fig 1) and the revised PCB can be identified by a black socket for the water body
flow sensor wiring plug (refer to fig 2).
Fig 1
Fig 2
Water Body Field Service Replacements
– 862/872 Series Commercial Models:
The revised water body, part number 41-18374-00, is now available as a spare part to use
as a service replacement for any commercial models (862/872 Series), however it must be
noted when fitting this revised water body to an existing heater manufactured pre-Feb 2018
it will also be necessary to replace the main PCB, part number 41-18376-00. Failure to
replace the PCB will result in the water heater not operating.
NOTE:
if the PCB socket for
the water body flow sensor plug is black (refer fig 2) this indicates that PCB has already
been modified and is compatible for use with revised water body and does not need to be
replaced again. Refer to TB18-001 for further details if required.
Water Body Field Service Replacements
– Domestic Models:
Existing domestic models (874/876/864/866) manufactured pre-Jan 2018 that require a new
water body or PCB do not need to undergo this revision and will continue to use the original
water body, part number 20-51136-00 or PCB, part number 41-02890-00 as required for
service replacements.
