Functional Troubleshooting - Rheem RPVS Series Installation, Operation & Maintenance Instructions Manual

R e s i d e n t i a l S p l i t
R e v. : 1 3 M a r c h , 2 0 1 5

Functional Troubleshooting

Fault
Main power Problems
Fault Code 27
HP Fault-Code 29
High pressure
LP/LOC Fault-Code 21
Low Pressure/Loss of Charge
FP1 Fault - Code 85
Water Coil low
temperature limit
FP2 fault - Code 86
Air Coil low
temperature limit
Condensate Fault-Code 25
Under Voltage- Code 09
(Auto resetting)
Unit Short Cycles
Only Fan Runs
50
Htg Clg Possible Cause
X X Low or no line voltage
X Reduced or no water flow
in cooling
X
Water Temperature out of range in
cooling
X Reduced or no Air flow
in heating
X
Air Temperature out of range in
heating
X X
Overcharged with refrigerant
X X
Bad HP Switch
X X Insufficient charge
Compressor pump down at start-
X
up
X Reduced or no water flow
in heating
X Inadequate anti-freeze level
Improper temperature limit setting
X
(30°F vs 10°F [-1°C vs -12°C])
X Water Temperature out of range
X X Bad thermistor
X Reduced or no Air flow
in cooling
X Air Temperature out of range
Improper temperature limit setting
X
(30°F vs 10°F [-1°C vs -12°C])
X X Bad thermistor
X X Blocked Drain
X X Improper trap
X Poor Drainage
X Moisture on sensor
X X Under Voltage
X X Dirty Air Filter
X X Unit in "Test Mode"
X X Unit selection
X X Compressor Overload
X X Thermostat position
X X Unit locked out
X X Compressor Overload
X X Thermostat wiring
Solution
Check Line Voltage circuit breaker and disconnect
Check for line voltage between L1 and L2 on the control
board
Check pump operation or valve operation/setting
Check water flow adjust to proper flow rate
Bring water temp within design parameters
Check for dirty air filter and clean or replace
Check fan motor operation and airflow restrictions
Dirty Air Coil- construction dust etc.
Too high of external static. Check static vs blower table
Bring return air temp within design parameters
Check superheat/subcooling vs typical operating condition
table
Check switch continuity and operation. Replace
Check for refrigerant leaks
Check charge and start-up water flow
Check pump operation or water valve operation/setting
Plugged strainer or filter. Clean or replace.
Check water flow adjust to proper flow rate
Check antifreeze density with hydrometer
Clip JW1 jumper for antifreeze (10°F [-12°C]) use
Bring water temp within design parameters
Check temp and impedance correlation per chart
Check for dirty air filter and clean or replace
Check fan motor operation and airflow restrictions
Too high of external static. Check static vs blower table
Too much cold vent air? Bring entering air temp within
design parameters
Normal airside applications will require 30°F [-1°C] only
Check temp and impedance correlation per chart
Check for blockage and clean drain
Check trap dimensions and location ahead of vent
Check for piping slope away from unit
Check slope of unit toward outlet
Poor venting. Check vent location
Check for moisture shorting to air coil
Check power supply and 24VAC voltage before and during
operation.
Check power supply wire size
Check compressor starting. Need hard start kit?
Check 24VAC and unit transformer tap for correct power
supply voltage
Check and Clean air filter
Reset power or wait 20 minutes for auto exit.
Unit may be oversized for space. Check sizing for actual
load of space.
Check and Replace if necessary
Insure thermostat set for heating or cooling operation
Check for lockout codes. Reset power.
Check compressor overload. Replace if necessary.
Check thermostat wiring at heat pump. Jumper Y and R
for compressor operation in test mode.