Resetting The Overheat Switch; Adjusting The Ignition Rod Gap; Adjusting The Flame Sensor - Rheem 834 Series Service Instructions Manual

Resetting the Overheat Switch

The overheat switch will open circuit (trip) when the detected
temperature reaches 95°C ± 4.5°C and must be manually reset by
pressing and releasing the reset button on the overheat switch
once temperatures have fallen to ≤ 90°C. The overheat switch is a
safety backup in case the hot water outlet 85°C shut down
(software) function does not operate.
If the overheat switch trips, determine cause of fault. Refer to 'Fault Finding
Chart – Red LED 7 Flash Indication' on page 27.

Adjusting the Ignition Rod Gap

The ignition rod gap is factory set and does not normally require adjusting. However, if
required, the gap can be checked and adjusted as follows:
If adjusting the ignition rod gap during the following procedure; do not
bend the ignition rod without holding with long nose pliers as described or
the ceramic will crack rendering the ignition rod inoperable.
1. Remove the pilot assembly shield by following steps 1 ~ 4 of
component replacement procedure 5 on page 51.
2. Check the ignition rod gap by measuring between the tip of
the ignition rod and the closest part of the pilot hood. The
gap should be 3.5 ~ 4.0 mm.
3. If the gap requires adjusting, remove the ignition rod, hold
the ignition rod metal section with a pair of long nose pliers
and gently bend the tip of the ignition rod with a pair of pliers
until the correct gap is obtained (to remove the ignition rod
refer to component replacement procedure 8 on page 52).

Adjusting the Flame Sensor

The flame sensor angle is factory set and does not normally require adjusting. However, if
required, the angle can be checked and adjusted as follows:
If adjusting the flame sensor during the following procedure; do not bend
the sensor rod without holding with long nose pliers as described or the
ceramic will crack rendering the sensor inoperable.
1. Remove the flame sensor assembly (refer to component
replacement procedure 9 on page 53).
2. Place the assembly on a flat surface (such as on a table) and
view from the right side. The flame rod should be at 90° to the
ceramic as depicted in the 'Right Side View' illustration.
3. Rotate assembly so that the 'Top View' is seen. The flame rod
measurements should be as depicted in the 'Top View'
illustration. Note: Place assembly near edge of table so that
measurements can be accurately obtained.
4. If the assembly requires adjusting, hold the flame rod metal
section with a pair of long nose pliers and gently bend the tip
of the probe with a pair of pliers until the correct
alignment/measurements are obtained.
TM081 Rheem 834 Series Hydroelectric CFGWH Service Instructions
REV: AA Issued: 22/02/17
This document is stored and maintained electronically by Rheem Technical Support. All printed copies are deemed uncontrolled.
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